78675638 has 32 divisors (see below), whose sum is σ = 126336672. Its totient is φ = 36691200.

The previous prime is 78675631. The next prime is 78675647. The reversal of 78675638 is 83657687.

Its product of digits (1693440) is a multiple of the sum of its prime divisors (560).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78675631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186668 + ... + 187088.

It is an arithmetic number, because the mean of its divisors is an integer number (3948021).

Almost surely, 2^78675638 is an apocalyptic number.

78675638 is a deficient number, since it is larger than the sum of its proper divisors (47661034).

78675638 is a wasteful number, since it uses less digits than its factorization.

78675638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its digits is 1693440, while the sum is 50.

The square root of 78675638 is about 8869.9288610451. The cubic root of 78675638 is about 428.4959858421.

The spelling of 78675638 in words is "seventy-eight million, six hundred seventy-five thousand, six hundred thirty-eight".