55132218 has 16 divisors (see below), whose sum is σ = 122516160. Its totient is φ = 18377388.

The previous prime is 55132213. The next prime is 55132237. The reversal of 55132218 is 81223155.

It is a happy number.

It is a super-2 number, since 2×55132218² = 6079122923199048, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55132191 and 55132200.

It is not an unprimeable number, because it can be changed into a prime (55132213) 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, 510430 + ... + 510537.

It is an arithmetic number, because the mean of its divisors is an integer number (7657260).

Almost surely, 2^55132218 is an apocalyptic number.

55132218 is an abundant number, since it is smaller than the sum of its proper divisors (67383942).

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

55132218 is a wasteful number, since it uses less digits than its factorization.

55132218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020978 (or 1020972 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 55132218 is about 7425.1072719524. The cubic root of 55132218 is about 380.5997408558.

The spelling of 55132218 in words is "fifty-five million, one hundred thirty-two thousand, two hundred eighteen".