78979638 has 16 divisors (see below), whose sum is σ = 159166656. Its totient is φ = 26125320.

The previous prime is 78979627. The next prime is 78979639. The reversal of 78979638 is 83697987.

It is a super-2 number, since 2×78979638² = 12475566437222088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78979639) 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, 49456 + ... + 51027.

It is an arithmetic number, because the mean of its divisors is an integer number (9947916).

Almost surely, 2^78979638 is an apocalyptic number.

78979638 is an abundant number, since it is smaller than the sum of its proper divisors (80187018).

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

78979638 is a wasteful number, since it uses less digits than its factorization.

78979638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100619.

The product of its digits is 4572288, while the sum is 57.

The square root of 78979638 is about 8887.0488915050. The cubic root of 78979638 is about 429.0471745168.

The spelling of 78979638 in words is "seventy-eight million, nine hundred seventy-nine thousand, six hundred thirty-eight".