83991679 has 16 divisors (see below), whose sum is σ = 93782016. Its totient is φ = 74851200.

The previous prime is 83991671. The next prime is 83991689. The reversal of 83991679 is 97619938.

It is a cyclic number.

It is not a de Polignac number, because 83991679 - 2³ = 83991671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83991671) 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, 23074 + ... + 26464.

It is an arithmetic number, because the mean of its divisors is an integer number (5861376).

Almost surely, 2^83991679 is an apocalyptic number.

83991679 is a deficient number, since it is larger than the sum of its proper divisors (9790337).

83991679 is a wasteful number, since it uses less digits than its factorization.

83991679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486.

The product of its digits is 734832, while the sum is 52.

The square root of 83991679 is about 9164.6974309030. The cubic root of 83991679 is about 437.9374524086.

The spelling of 83991679 in words is "eighty-three million, nine hundred ninety-one thousand, six hundred seventy-nine".