72942865 has 4 divisors (see below), whose sum is σ = 87531444. Its totient is φ = 58354288.

The previous prime is 72942829. The next prime is 72942889. The reversal of 72942865 is 56824927.

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 56685841 + 16257024 = 7529^2 + 4032^2 .

It is a cyclic number.

It is not a de Polignac number, because 72942865 - 2¹¹ = 72940817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7294282 + ... + 7294291.

It is an arithmetic number, because the mean of its divisors is an integer number (21882861).

Almost surely, 2^72942865 is an apocalyptic number.

It is an amenable number.

72942865 is a deficient number, since it is larger than the sum of its proper divisors (14588579).

72942865 is a wasteful number, since it uses less digits than its factorization.

72942865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588578.

The product of its digits is 241920, while the sum is 43.

The square root of 72942865 is about 8540.6595178593. The cubic root of 72942865 is about 417.8248562275.

The spelling of 72942865 in words is "seventy-two million, nine hundred forty-two thousand, eight hundred sixty-five".