79877980 has 48 divisors (see below), whose sum is σ = 206458560. Its totient is φ = 25279488.

The previous prime is 79877969. The next prime is 79877981. The reversal of 79877980 is 8977897.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79877981) 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, 20125 + ... + 23764.

It is an arithmetic number, because the mean of its divisors is an integer number (4301220).

Almost surely, 2^79877980 is an apocalyptic number.

79877980 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79877980 is an abundant number, since it is smaller than the sum of its proper divisors (126580580).

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

79877980 is a wasteful number, since it uses less digits than its factorization.

79877980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43918 (or 43916 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 79877980 is about 8937.4481816680. The cubic root of 79877980 is about 430.6677564323.

The spelling of 79877980 in words is "seventy-nine million, eight hundred seventy-seven thousand, nine hundred eighty".