79901220 has 96 divisors (see below), whose sum is σ = 258306048. Its totient is φ = 18076032.

The previous prime is 79901219. The next prime is 79901233. The reversal of 79901220 is 2210997.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42337 + ... + 44183.

It is an arithmetic number, because the mean of its divisors is an integer number (2690688).

Almost surely, 2^79901220 is an apocalyptic number.

79901220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79901220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129153024).

79901220 is an abundant number, since it is smaller than the sum of its proper divisors (178404828).

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

79901220 is a wasteful number, since it uses less digits than its factorization.

79901220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1969 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 79901220 is about 8938.7482345125. The cubic root of 79901220 is about 430.7095190814.

The spelling of 79901220 in words is "seventy-nine million, nine hundred one thousand, two hundred twenty".