79797990 has 32 divisors (see below), whose sum is σ = 191846880. Its totient is φ = 21242624.

The previous prime is 79797989. The next prime is 79797997. The reversal of 79797990 is 9979797.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 79797990.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79797997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18346 + ... + 22274.

It is an arithmetic number, because the mean of its divisors is an integer number (5995215).

Almost surely, 2^79797990 is an apocalyptic number.

79797990 is an abundant number, since it is smaller than the sum of its proper divisors (112048890).

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

79797990 is a wasteful number, since it uses less digits than its factorization.

79797990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4616.

The product of its (nonzero) digits is 2250423, while the sum is 57.

The square root of 79797990 is about 8932.9720698097. The cubic root of 79797990 is about 430.5239511792.

The spelling of 79797990 in words is "seventy-nine million, seven hundred ninety-seven thousand, nine hundred ninety".