78572864 has 14 divisors (see below), whose sum is σ = 155918154. Its totient is φ = 39286400.

The previous prime is 78572831. The next prime is 78572869. The reversal of 78572864 is 46827587.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 2534464 = 8720^2 + 1592^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78572869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613787 + ... + 613914.

It is an arithmetic number, because the mean of its divisors is an integer number (11137011).

Almost surely, 2^78572864 is an apocalyptic number.

It is an amenable number.

78572864 is a deficient number, since it is larger than the sum of its proper divisors (77345290).

78572864 is a wasteful number, since it uses less digits than its factorization.

78572864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227713 (or 1227703 counting only the distinct ones).

The product of its digits is 752640, while the sum is 47.

The square root of 78572864 is about 8864.1335730008. The cubic root of 78572864 is about 428.3093230783.

The spelling of 78572864 in words is "seventy-eight million, five hundred seventy-two thousand, eight hundred sixty-four".