55208979 has 32 divisors (see below), whose sum is σ = 98979840. Its totient is φ = 29690496.

The previous prime is 55208969. The next prime is 55208981. The reversal of 55208979 is 97980255.

It is a happy number.

55208979 is a `hidden beast` number, since 552 + 0 + 8 + 97 + 9 = 666.

It is not a de Polignac number, because 55208979 - 2⁸ = 55208723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55208929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5379 + ... + 11804.

It is an arithmetic number, because the mean of its divisors is an integer number (3093120).

Almost surely, 2^55208979 is an apocalyptic number.

55208979 is a deficient number, since it is larger than the sum of its proper divisors (43770861).

55208979 is a wasteful number, since it uses less digits than its factorization.

55208979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17216 (or 17210 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 45.

The square root of 55208979 is about 7430.2744902191. The cubic root of 55208979 is about 380.7762962311.

The spelling of 55208979 in words is "fifty-five million, two hundred eight thousand, nine hundred seventy-nine".