78313864 has 16 divisors (see below), whose sum is σ = 146934720. Its totient is φ = 39131280.

The previous prime is 78313861. The next prime is 78313897. The reversal of 78313864 is 46831387.

It is a super-2 number, since 2×78313864² = 12266122589220992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78313861) 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 in 3 ways as a sum of consecutive naturals, for example, 18069 + ... + 21979.

It is an arithmetic number, because the mean of its divisors is an integer number (9183420).

Almost surely, 2^78313864 is an apocalyptic number.

It is an amenable number.

78313864 is a deficient number, since it is larger than the sum of its proper divisors (68620856).

78313864 is a wasteful number, since it uses less digits than its factorization.

78313864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6420 (or 6416 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 78313864 is about 8849.5120769453. The cubic root of 78313864 is about 427.8381925405.

The spelling of 78313864 in words is "seventy-eight million, three hundred thirteen thousand, eight hundred sixty-four".