55779979 has 8 divisors (see below), whose sum is σ = 58145168. Its totient is φ = 53460000.

The previous prime is 55779923. The next prime is 55779989. The reversal of 55779979 is 97997755.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55779979 - 2⁹ = 55779467 is a prime.

It is a super-2 number, since 2×55779979² = 6222812114480882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55779989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8772 + ... + 13729.

It is an arithmetic number, because the mean of its divisors is an integer number (7268146).

Almost surely, 2^55779979 is an apocalyptic number.

55779979 is a deficient number, since it is larger than the sum of its proper divisors (2365189).

55779979 is a wasteful number, since it uses less digits than its factorization.

55779979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22605.

The product of its digits is 6251175, while the sum is 58.

The square root of 55779979 is about 7468.5995340492. The cubic root of 55779979 is about 382.0845253049.

The spelling of 55779979 in words is "fifty-five million, seven hundred seventy-nine thousand, nine hundred seventy-nine".