2639479979 has 4 divisors (see below), whose sum is σ = 2730496560. Its totient is φ = 2548463400.

The previous prime is 2639479951. The next prime is 2639480021. The reversal of 2639479979 is 9799749362.

It is a happy number.

2639479979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2639479979 - 2²⁰ = 2638431403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2639479939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45508247 + ... + 45508304.

It is an arithmetic number, because the mean of its divisors is an integer number (682624140).

Almost surely, 2^2639479979 is an apocalyptic number.

2639479979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2639479979 is a deficient number, since it is larger than the sum of its proper divisors (91016581).

2639479979 is an equidigital number, since it uses as much as digits as its factorization.

2639479979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91016580.

The product of its digits is 46294416, while the sum is 65.

The square root of 2639479979 is about 51375.8696179442. The cubic root of 2639479979 is about 1381.9938934473.

The spelling of 2639479979 in words is "two billion, six hundred thirty-nine million, four hundred seventy-nine thousand, nine hundred seventy-nine".