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72989671 = 584912479
BaseRepresentation
bin1000101100110…
…11101111100111
312002100021000011
410112123233213
5122141132141
611124231051
71544254606
oct426335747
9162307004
1072989671
1138223247
122053b487
1312177571
14999da3d
15661b881
hex459bbe7

72989671 has 4 divisors (see below), whose sum is σ = 73008000. Its totient is φ = 72971344.

The previous prime is 72989629. The next prime is 72989677. The reversal of 72989671 is 17698927.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17698927 = 115115377.

It is a cyclic number.

It is not a de Polignac number, because 72989671 - 211 = 72987623 is a prime.

It is a Smith number, since the sum of its digits (49) 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (72989677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391 + ... + 12088.

It is an arithmetic number, because the mean of its divisors is an integer number (18252000).

Almost surely, 272989671 is an apocalyptic number.

72989671 is a deficient number, since it is larger than the sum of its proper divisors (18329).

72989671 is a wasteful number, since it uses less digits than its factorization.

72989671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18328.

The product of its digits is 381024, while the sum is 49.

The square root of 72989671 is about 8543.3992649296. The cubic root of 72989671 is about 417.9142071127.

The spelling of 72989671 in words is "seventy-two million, nine hundred eighty-nine thousand, six hundred seventy-one".

Divisors: 1 5849 12479 72989671