79779918 has 32 divisors (see below), whose sum is σ = 166677120. Its totient is φ = 25431840.

The previous prime is 79779911. The next prime is 79779923. The reversal of 79779918 is 81997797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79779911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10053 + ... + 16143.

It is an arithmetic number, because the mean of its divisors is an integer number (5208660).

Almost surely, 2^79779918 is an apocalyptic number.

79779918 is an abundant number, since it is smaller than the sum of its proper divisors (86897202).

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

79779918 is a wasteful number, since it uses less digits than its factorization.

79779918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6192.

The product of its digits is 2000376, while the sum is 57.

The square root of 79779918 is about 8931.9604790886. The cubic root of 79779918 is about 430.4914482040.

The spelling of 79779918 in words is "seventy-nine million, seven hundred seventy-nine thousand, nine hundred eighteen".