78553864 has 16 divisors (see below), whose sum is σ = 147555900. Its totient is φ = 39205632.

The previous prime is 78553859. The next prime is 78553883. The reversal of 78553864 is 46835587.

It can be written as a sum of positive squares in 2 ways, for example, as 61496964 + 17056900 = 7842^2 + 4130^2 .

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, 4077 + ... + 13180.

Almost surely, 2^78553864 is an apocalyptic number.

It is an amenable number.

78553864 is a deficient number, since it is larger than the sum of its proper divisors (69002036).

78553864 is a wasteful number, since it uses less digits than its factorization.

78553864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17832 (or 17828 counting only the distinct ones).

The product of its digits is 806400, while the sum is 46.

The square root of 78553864 is about 8863.0617734505. The cubic root of 78553864 is about 428.2747965986.

The spelling of 78553864 in words is "seventy-eight million, five hundred fifty-three thousand, eight hundred sixty-four".