79705820 has 24 divisors (see below), whose sum is σ = 167608224. Its totient is φ = 31839296.

The previous prime is 79705781. The next prime is 79705823. The reversal of 79705820 is 2850797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79705823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15494 + ... + 19986.

It is an arithmetic number, because the mean of its divisors is an integer number (6983676).

Almost surely, 2^79705820 is an apocalyptic number.

It is an amenable number.

79705820 is an abundant number, since it is smaller than the sum of its proper divisors (87902404).

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

79705820 is a wasteful number, since it uses less digits than its factorization.

79705820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5389 (or 5387 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 79705820 is about 8927.8116019549. The cubic root of 79705820 is about 430.3581296246.

The spelling of 79705820 in words is "seventy-nine million, seven hundred five thousand, eight hundred twenty".