72878656 has 14 divisors (see below), whose sum is σ = 144618710. Its totient is φ = 36439296.

The previous prime is 72878579. The next prime is 72878669. The reversal of 72878656 is 65687827.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 968256 = 8480^2 + 984^2 .

It is a super-2 number, since 2×72878656² = 10622597000732672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569301 + ... + 569428.

Almost surely, 2^72878656 is an apocalyptic number.

It is an amenable number.

72878656 is a deficient number, since it is larger than the sum of its proper divisors (71740054).

72878656 is a wasteful number, since it uses less digits than its factorization.

72878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138741 (or 1138731 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 49.

The square root of 72878656 is about 8536.8996714264. The cubic root of 72878656 is about 417.7022214686.

The spelling of 72878656 in words is "seventy-two million, eight hundred seventy-eight thousand, six hundred fifty-six".