55220232 has 64 divisors (see below), whose sum is σ = 147168000. Its totient is φ = 17216064.

The previous prime is 55220219. The next prime is 55220237. The reversal of 55220232 is 23202255.

It is a junction number, because it is equal to n+sod(n) for n = 55220199 and 55220208.

It is not an unprimeable number, because it can be changed into a prime (55220237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37119 + ... + 38577.

It is an arithmetic number, because the mean of its divisors is an integer number (2299500).

Almost surely, 2^55220232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55220232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73584000).

55220232 is an abundant number, since it is smaller than the sum of its proper divisors (91947768).

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

55220232 is a wasteful number, since it uses less digits than its factorization.

55220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 55220232 is about 7431.0316914948. The cubic root of 55220232 is about 380.8021651184.

Adding to 55220232 its reverse (23202255), we get a palindrome (78422487).

The spelling of 55220232 in words is "fifty-five million, two hundred twenty thousand, two hundred thirty-two".