79866990 has 96 divisors (see below), whose sum is σ = 238657536. Its totient is φ = 18152640.

The previous prime is 79866989. The next prime is 79866991. The reversal of 79866990 is 9966897.

It is an interprime number because it is at equal distance from previous prime (79866989) and next prime (79866991).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79866991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 208339 + ... + 208721.

It is an arithmetic number, because the mean of its divisors is an integer number (2486016).

Almost surely, 2^79866990 is an apocalyptic number.

79866990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 79866990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119328768).

79866990 is an abundant number, since it is smaller than the sum of its proper divisors (158790546).

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

79866990 is a wasteful number, since it uses less digits than its factorization.

79866990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 79866990 is about 8936.8333317792. The cubic root of 79866990 is about 430.6480044067.

The spelling of 79866990 in words is "seventy-nine million, eight hundred sixty-six thousand, nine hundred ninety".