78808638 has 16 divisors (see below), whose sum is σ = 157856256. Its totient is φ = 26229720.

The previous prime is 78808627. The next prime is 78808643. The reversal of 78808638 is 83680887.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5518 + ... + 13713.

It is an arithmetic number, because the mean of its divisors is an integer number (9866016).

Almost surely, 2^78808638 is an apocalyptic number.

78808638 is an abundant number, since it is smaller than the sum of its proper divisors (79047618).

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

78808638 is a wasteful number, since it uses less digits than its factorization.

78808638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19919.

The product of its (nonzero) digits is 516096, while the sum is 48.

The square root of 78808638 is about 8877.4229368663. The cubic root of 78808638 is about 428.7373052819.

The spelling of 78808638 in words is "seventy-eight million, eight hundred eight thousand, six hundred thirty-eight".