55729979 has 4 divisors (see below), whose sum is σ = 55757376. Its totient is φ = 55702584.

The previous prime is 55729969. The next prime is 55729991. The reversal of 55729979 is 97992755.

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 55729979 - 2¹² = 55725883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55729979.

It is not an unprimeable number, because it can be changed into a prime (55729939) 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, 10379 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (13939344).

Almost surely, 2^55729979 is an apocalyptic number.

55729979 is a deficient number, since it is larger than the sum of its proper divisors (27397).

55729979 is a wasteful number, since it uses less digits than its factorization.

55729979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27396.

The product of its digits is 1786050, while the sum is 53.

The square root of 55729979 is about 7465.2514358192. The cubic root of 55729979 is about 381.9703269990.

It can be divided in two parts, 5572 and 9979, that added together give a palindrome (15551).

The spelling of 55729979 in words is "fifty-five million, seven hundred twenty-nine thousand, nine hundred seventy-nine".