79991201220 has 48 divisors (see below), whose sum is σ = 255971845248. Its totient is φ = 18283703040.

The previous prime is 79991201219. The next prime is 79991201273. The reversal of 79991201220 is 2210219997.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95227201 + ... + 95228040.

It is an arithmetic number, because the mean of its divisors is an integer number (5332746776).

Almost surely, 2^79991201220 is an apocalyptic number.

79991201220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

79991201220 is an abundant number, since it is smaller than the sum of its proper divisors (175980644028).

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

79991201220 is a wasteful number, since it uses less digits than its factorization.

79991201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190455260 (or 190455258 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 79991201220 in words is "seventy-nine billion, nine hundred ninety-one million, two hundred one thousand, two hundred twenty".