55645220 has 24 divisors (see below), whose sum is σ = 117063744. Its totient is φ = 22218336.

The previous prime is 55645207. The next prime is 55645253. The reversal of 55645220 is 2254655.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10697 + ... + 15023.

It is an arithmetic number, because the mean of its divisors is an integer number (4877656).

Almost surely, 2^55645220 is an apocalyptic number.

It is an amenable number.

55645220 is an abundant number, since it is smaller than the sum of its proper divisors (61418524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55645220 is a wasteful number, since it uses less digits than its factorization.

55645220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4979 (or 4977 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 55645220 is about 7459.5723738027. The cubic root of 55645220 is about 381.7765841785.

Adding to 55645220 its reverse (2254655), we get a palindrome (57899875).

The spelling of 55645220 in words is "fifty-five million, six hundred forty-five thousand, two hundred twenty".