72707690 has 24 divisors (see below), whose sum is σ = 143855460. Its totient is φ = 26438720.

The previous prime is 72707689. The next prime is 72707693. The reversal of 72707690 is 9670727.

It can be written as a sum of positive squares in 2 ways, for example, as 66797929 + 5909761 = 8173^2 + 2431^2 .

It is a super-2 number, since 2×72707690² = 10572816370272200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (72707693) 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, 28835 + ... + 31254.

Almost surely, 2^72707690 is an apocalyptic number.

72707690 is a deficient number, since it is larger than the sum of its proper divisors (71147770).

72707690 is a wasteful number, since it uses less digits than its factorization.

72707690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60118 (or 60107 counting only the distinct ones).

The product of its (nonzero) digits is 37044, while the sum is 38.

The square root of 72707690 is about 8526.8804377686. The cubic root of 72707690 is about 417.3753365831.

The spelling of 72707690 in words is "seventy-two million, seven hundred seven thousand, six hundred ninety".