72907865 has 8 divisors (see below), whose sum is σ = 87654408. Its totient is φ = 58216320.

The previous prime is 72907847. The next prime is 72907867. The reversal of 72907865 is 56870927.

It can be written as a sum of positive squares in 4 ways, for example, as 9339136 + 63568729 = 3056^2 + 7973^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72907865 - 2⁸ = 72907609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72907867) 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 7 ways as a sum of consecutive naturals, for example, 10772 + ... + 16181.

It is an arithmetic number, because the mean of its divisors is an integer number (10956801).

Almost surely, 2^72907865 is an apocalyptic number.

It is an amenable number.

72907865 is a deficient number, since it is larger than the sum of its proper divisors (14746543).

72907865 is a wasteful number, since it uses less digits than its factorization.

72907865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27499.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 72907865 is about 8538.6102499177. The cubic root of 72907865 is about 417.7580175698.

The spelling of 72907865 in words is "seventy-two million, nine hundred seven thousand, eight hundred sixty-five".