79877940 has 24 divisors (see below), whose sum is σ = 223658400. Its totient is φ = 21300768.

The previous prime is 79877933. The next prime is 79877969. The reversal of 79877940 is 4977897.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 665590 + ... + 665709.

It is an arithmetic number, because the mean of its divisors is an integer number (9319100).

Almost surely, 2^79877940 is an apocalyptic number.

It is an amenable number.

79877940 is an abundant number, since it is smaller than the sum of its proper divisors (143780460).

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

79877940 is a wasteful number, since it uses less digits than its factorization.

79877940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331311 (or 1331309 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 51.

The square root of 79877940 is about 8937.4459438925. The cubic root of 79877940 is about 430.6676845447.

The spelling of 79877940 in words is "seventy-nine million, eight hundred seventy-seven thousand, nine hundred forty".