79138480 has 20 divisors (see below), whose sum is σ = 183997152. Its totient is φ = 31655360.

The previous prime is 79138441. The next prime is 79138481. The reversal of 79138480 is 8483197.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (79138481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494536 + ... + 494695.

Almost surely, 2^79138480 is an apocalyptic number.

It is an amenable number.

79138480 is an abundant number, since it is smaller than the sum of its proper divisors (104858672).

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

79138480 is a wasteful number, since it uses less digits than its factorization.

79138480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989244 (or 989238 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 79138480 is about 8895.9811150879. The cubic root of 79138480 is about 429.3346117867.

The spelling of 79138480 in words is "seventy-nine million, one hundred thirty-eight thousand, four hundred eighty".