79900155 has 32 divisors (see below), whose sum is σ = 142955520. Its totient is φ = 42340320.

The previous prime is 79900151. The next prime is 79900159. The reversal of 79900155 is 55100997.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79900151) and next prime (79900159).

It is not a de Polignac number, because 79900155 - 2² = 79900151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79900151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20190 + ... + 23820.

It is an arithmetic number, because the mean of its divisors is an integer number (4467360).

Almost surely, 2^79900155 is an apocalyptic number.

79900155 is a deficient number, since it is larger than the sum of its proper divisors (63055365).

79900155 is a wasteful number, since it uses less digits than its factorization.

79900155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808 (or 3802 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 79900155 is about 8938.6886622144. The cubic root of 79900155 is about 430.7076054366.

The spelling of 79900155 in words is "seventy-nine million, nine hundred thousand, one hundred fifty-five".