79980511 has 16 divisors (see below), whose sum is σ = 88510464. Its totient is φ = 71810784.

The previous prime is 79980491. The next prime is 79980581. The reversal of 79980511 is 11508997.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 79980511 - 2¹¹ = 79978463 is a prime.

It is a super-2 number, since 2×79980511² = 12793764279642242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79980581) 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, 135960 + ... + 136546.

It is an arithmetic number, because the mean of its divisors is an integer number (5531904).

Almost surely, 2^79980511 is an apocalyptic number.

79980511 is a deficient number, since it is larger than the sum of its proper divisors (8529953).

79980511 is a wasteful number, since it uses less digits than its factorization.

79980511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its (nonzero) digits is 22680, while the sum is 40.

The square root of 79980511 is about 8943.1823754187. The cubic root of 79980511 is about 430.8519453499.

The spelling of 79980511 in words is "seventy-nine million, nine hundred eighty thousand, five hundred eleven".