78392872 has 16 divisors (see below), whose sum is σ = 147107700. Its totient is φ = 39164160.

The previous prime is 78392857. The next prime is 78392903. The reversal of 78392872 is 27829387.

It can be written as a sum of positive squares in 2 ways, for example, as 72012196 + 6380676 = 8486^2 + 2526^2 .

It is a super-2 number, since 2×78392872² = 12290884760816768, which contains 22 as substring.

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, 8622 + ... + 15202.

Almost surely, 2^78392872 is an apocalyptic number.

It is an amenable number.

78392872 is a deficient number, since it is larger than the sum of its proper divisors (68714828).

78392872 is a wasteful number, since it uses less digits than its factorization.

78392872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8076 (or 8072 counting only the distinct ones).

The product of its digits is 338688, while the sum is 46.

The square root of 78392872 is about 8853.9749265514. The cubic root of 78392872 is about 427.9820209643.

The spelling of 78392872 in words is "seventy-eight million, three hundred ninety-two thousand, eight hundred seventy-two".