72508957 has 4 divisors (see below), whose sum is σ = 72825820. Its totient is φ = 72192096.

The previous prime is 72508873. The next prime is 72508967. The reversal of 72508957 is 75980527.

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 63059481 + 9449476 = 7941^2 + 3074^2 .

It is a cyclic number.

It is not a de Polignac number, because 72508957 - 2⁷ = 72508829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72508967) 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, 158088 + ... + 158545.

It is an arithmetic number, because the mean of its divisors is an integer number (18206455).

Almost surely, 2^72508957 is an apocalyptic number.

It is an amenable number.

72508957 is a deficient number, since it is larger than the sum of its proper divisors (316863).

72508957 is a wasteful number, since it uses less digits than its factorization.

72508957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316862.

The product of its (nonzero) digits is 176400, while the sum is 43.

The square root of 72508957 is about 8515.2191398695. The cubic root of 72508957 is about 416.9947168693.

The spelling of 72508957 in words is "seventy-two million, five hundred eight thousand, nine hundred fifty-seven".