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72665941 = 617117773
BaseRepresentation
bin1000101010011…
…00101101010101
312001201210221011
410111030231111
5122100302231
611113252221
71541436025
oct425145525
9161653834
1072665941
1138021aa7
1220404071
13120930ca
149917a85
1565a59b1
hex454cb55

72665941 has 4 divisors (see below), whose sum is σ = 72784332. Its totient is φ = 72547552.

The previous prime is 72665933. The next prime is 72665963. The reversal of 72665941 is 14956627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14956627 = 72136661.

It can be written as a sum of positive squares in 2 ways, for example, as 9796900 + 62869041 = 3130^2 + 7929^2 .

It is a cyclic number.

It is not a de Polignac number, because 72665941 - 23 = 72665933 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72665894 and 72665903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72665921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58270 + ... + 59503.

It is an arithmetic number, because the mean of its divisors is an integer number (18196083).

Almost surely, 272665941 is an apocalyptic number.

It is an amenable number.

72665941 is a deficient number, since it is larger than the sum of its proper divisors (118391).

72665941 is a wasteful number, since it uses less digits than its factorization.

72665941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118390.

The product of its digits is 90720, while the sum is 40.

The square root of 72665941 is about 8524.4320045385. The cubic root of 72665941 is about 417.2954351809.

The spelling of 72665941 in words is "seventy-two million, six hundred sixty-five thousand, nine hundred forty-one".

Divisors: 1 617 117773 72665941