72765656 has 16 divisors (see below), whose sum is σ = 136544400. Its totient is φ = 36353824.

The previous prime is 72765607. The next prime is 72765673. The reversal of 72765656 is 65656727.

It is a super-2 number, since 2×72765656² = 10589681386220672, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10085 + ... + 15723.

It is an arithmetic number, because the mean of its divisors is an integer number (8534025).

Almost surely, 2^72765656 is an apocalyptic number.

It is an amenable number.

72765656 is a deficient number, since it is larger than the sum of its proper divisors (63778744).

72765656 is a wasteful number, since it uses less digits than its factorization.

72765656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7258 (or 7254 counting only the distinct ones).

The product of its digits is 529200, while the sum is 44.

The square root of 72765656 is about 8530.2787762183. The cubic root of 72765656 is about 417.4862242219.

The spelling of 72765656 in words is "seventy-two million, seven hundred sixty-five thousand, six hundred fifty-six".