83980779 has 16 divisors (see below), whose sum is σ = 120096000. Its totient is φ = 52037856.

The previous prime is 83980759. The next prime is 83980789. The reversal of 83980779 is 97708938.

It is a happy number.

It is not a de Polignac number, because 83980779 - 2⁵ = 83980747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83980759) 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 15 ways as a sum of consecutive naturals, for example, 10879 + ... + 16920.

It is an arithmetic number, because the mean of its divisors is an integer number (7506000).

Almost surely, 2^83980779 is an apocalyptic number.

83980779 is a deficient number, since it is larger than the sum of its proper divisors (36115221).

83980779 is a wasteful number, since it uses less digits than its factorization.

83980779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27874.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 83980779 is about 9164.1027384027. The cubic root of 83980779 is about 437.9185071797.

It can be divided in two parts, 839 and 80779, that added together give a palindrome (81618).

The spelling of 83980779 in words is "eighty-three million, nine hundred eighty thousand, seven hundred seventy-nine".