78739638 has 16 divisors (see below), whose sum is σ = 158925360. Its totient is φ = 26005536.

The previous prime is 78739637. The next prime is 78739651. The reversal of 78739638 is 83693787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78739637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59545 + ... + 60852.

It is an arithmetic number, because the mean of its divisors is an integer number (9932835).

Almost surely, 2^78739638 is an apocalyptic number.

78739638 is an abundant number, since it is smaller than the sum of its proper divisors (80185722).

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

78739638 is a wasteful number, since it uses less digits than its factorization.

78739638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120511.

The product of its digits is 1524096, while the sum is 51.

The square root of 78739638 is about 8873.5358228837. The cubic root of 78739638 is about 428.6121434018.

The spelling of 78739638 in words is "seventy-eight million, seven hundred thirty-nine thousand, six hundred thirty-eight".