79388890 has 32 divisors (see below), whose sum is σ = 165162240. Its totient is φ = 26911104.

The previous prime is 79388873. The next prime is 79388899. The reversal of 79388890 is 9888397.

It is not an unprimeable number, because it can be changed into a prime (79388899) 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, 142 + ... + 12601.

It is an arithmetic number, because the mean of its divisors is an integer number (5161320).

Almost surely, 2^79388890 is an apocalyptic number.

79388890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

79388890 is an abundant number, since it is smaller than the sum of its proper divisors (85773350).

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

79388890 is a wasteful number, since it uses less digits than its factorization.

79388890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12846.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 79388890 is about 8910.0443321007. The cubic root of 79388890 is about 429.7869685711.

The spelling of 79388890 in words is "seventy-nine million, three hundred eighty-eight thousand, eight hundred ninety".