79887121920 has 120 divisors (see below), whose sum is σ = 276671651256. Its totient is φ = 21303226368.

The previous prime is 79887121891. The next prime is 79887121961. The reversal of 79887121920 is 2912178897.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1710622 + ... + 1756701.

Almost surely, 2^79887121920 is an apocalyptic number.

It is an amenable number.

79887121920 is an abundant number, since it is smaller than the sum of its proper divisors (196784529336).

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

79887121920 is a wasteful number, since it uses less digits than its factorization.

79887121920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467352 (or 3467333 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 79887121920 in words is "seventy-nine billion, eight hundred eighty-seven million, one hundred twenty-one thousand, nine hundred twenty".