72640976 has 10 divisors (see below), whose sum is σ = 140741922. Its totient is φ = 36320480.

The previous prime is 72640973. The next prime is 72640993. The reversal of 72640976 is 67904627.

It can be written as a sum of positive squares in only one way, i.e., 67240000 + 5400976 = 8200^2 + 2324^2 .

It is a super-2 number, since 2×72640976² = 10553422788465152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72640973) by changing a digit.

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 as a sum of consecutive naturals, namely, 2270015 + ... + 2270046.

Almost surely, 2^72640976 is an apocalyptic number.

It is an amenable number.

72640976 is a deficient number, since it is larger than the sum of its proper divisors (68100946).

72640976 is a wasteful number, since it uses less digits than its factorization.

72640976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4540069 (or 4540063 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 41.

The square root of 72640976 is about 8522.9675583097. The cubic root of 72640976 is about 417.2476412458.

The spelling of 72640976 in words is "seventy-two million, six hundred forty thousand, nine hundred seventy-six".