72169841 has 4 divisors (see below), whose sum is σ = 72543972. Its totient is φ = 71795712.

The previous prime is 72169831. The next prime is 72169849. The reversal of 72169841 is 14896127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27667600 + 44502241 = 5260^2 + 6671^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72169841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72169795 and 72169804.

It is not an unprimeable number, because it can be changed into a prime (72169849) 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, 186776 + ... + 187161.

It is an arithmetic number, because the mean of its divisors is an integer number (18135993).

Almost surely, 2^72169841 is an apocalyptic number.

It is an amenable number.

72169841 is a deficient number, since it is larger than the sum of its proper divisors (374131).

72169841 is a wasteful number, since it uses less digits than its factorization.

72169841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374130.

The product of its digits is 24192, while the sum is 38.

The square root of 72169841 is about 8495.2834561302. The cubic root of 72169841 is about 416.3436221038.

The spelling of 72169841 in words is "seventy-two million, one hundred sixty-nine thousand, eight hundred forty-one".