72257207 has 12 divisors (see below), whose sum is σ = 80179848. Its totient is φ = 65062800.

The previous prime is 72257173. The next prime is 72257233. The reversal of 72257207 is 70275227.

It is a de Polignac number, because none of the positive numbers 2^k-72257207 is a prime.

It is a super-2 number, since 2×72257207² = 10442207926881698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72257407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10157 + ... + 15737.

It is an arithmetic number, because the mean of its divisors is an integer number (6681654).

Almost surely, 2^72257207 is an apocalyptic number.

72257207 is a deficient number, since it is larger than the sum of its proper divisors (7922641).

72257207 is a wasteful number, since it uses less digits than its factorization.

72257207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 72257207 is about 8500.4239306049. The cubic root of 72257207 is about 416.5115574837.

The spelling of 72257207 in words is "seventy-two million, two hundred fifty-seven thousand, two hundred seven".