72907057 has 4 divisors (see below), whose sum is σ = 74877556. Its totient is φ = 70936560.

The previous prime is 72907049. The next prime is 72907063. The reversal of 72907057 is 75070927.

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 67223601 + 5683456 = 8199^2 + 2384^2 .

It is a cyclic number.

It is not a de Polignac number, because 72907057 - 2³ = 72907049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1970461 = 72907057 / (7 + 2 + 9 + 0 + 7 + 0 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72907007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 985194 + ... + 985267.

It is an arithmetic number, because the mean of its divisors is an integer number (18719389).

Almost surely, 2^72907057 is an apocalyptic number.

It is an amenable number.

72907057 is a deficient number, since it is larger than the sum of its proper divisors (1970499).

72907057 is a wasteful number, since it uses less digits than its factorization.

72907057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1970498.

The product of its (nonzero) digits is 30870, while the sum is 37.

The square root of 72907057 is about 8538.5629352954. The cubic root of 72907057 is about 417.7564742990.

The spelling of 72907057 in words is "seventy-two million, nine hundred seven thousand, fifty-seven".