27979855920 has 120 divisors (see below), whose sum is σ = 97445960976. Its totient is φ = 7461289728.

The previous prime is 27979855913. The next prime is 27979855979. The reversal of 27979855920 is 2955897972.

27979855920 is a `hidden beast` number, since 2 + 7 + 9 + 79 + 8 + 559 + 2 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 700207 + ... + 739086.

Almost surely, 2^27979855920 is an apocalyptic number.

27979855920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27979855920 is an abundant number, since it is smaller than the sum of its proper divisors (69466105056).

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

27979855920 is a wasteful number, since it uses less digits than its factorization.

27979855920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1439321 (or 1439303 counting only the distinct ones).

The product of its (nonzero) digits is 28576800, while the sum is 63.

The spelling of 27979855920 in words is "twenty-seven billion, nine hundred seventy-nine million, eight hundred fifty-five thousand, nine hundred twenty".