55032220 has 12 divisors (see below), whose sum is σ = 115567704. Its totient is φ = 22012880.

The previous prime is 55032199. The next prime is 55032221. The reversal of 55032220 is 2223055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55032221) 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, 1375786 + ... + 1375825.

It is an arithmetic number, because the mean of its divisors is an integer number (9630642).

Almost surely, 2^55032220 is an apocalyptic number.

It is an amenable number.

55032220 is an abundant number, since it is smaller than the sum of its proper divisors (60535484).

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

55032220 is a wasteful number, since it uses less digits than its factorization.

55032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751620 (or 2751618 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 55032220 is about 7418.3704410066. The cubic root of 55032220 is about 380.3694928695.

Adding to 55032220 its reverse (2223055), we get a palindrome (57255275).

The spelling of 55032220 in words is "fifty-five million, thirty-two thousand, two hundred twenty".