78537864 has 32 divisors (see below), whose sum is σ = 196751520. Its totient is φ = 26125056.

The previous prime is 78537859. The next prime is 78537883. The reversal of 78537864 is 46873587.

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 7 ways as a sum of consecutive naturals, for example, 9424 + ... + 15680.

It is an arithmetic number, because the mean of its divisors is an integer number (6148485).

Almost surely, 2^78537864 is an apocalyptic number.

It is an amenable number.

78537864 is an abundant number, since it is smaller than the sum of its proper divisors (118213656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78537864 is a wasteful number, since it uses less digits than its factorization.

78537864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6789 (or 6785 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 48.

The square root of 78537864 is about 8862.1591048683. The cubic root of 78537864 is about 428.2457173499.

It can be divided in two parts, 78537 and 864, that added together give a triangular number (79401 = T₃₉₈).

The spelling of 78537864 in words is "seventy-eight million, five hundred thirty-seven thousand, eight hundred sixty-four".