55221828 has 24 divisors (see below), whose sum is σ = 135633120. Its totient is φ = 17438400.

The previous prime is 55221821. The next prime is 55221841. The reversal of 55221828 is 82812255.

It is not an unprimeable number, because it can be changed into a prime (55221821) 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, 120873 + ... + 121328.

It is an arithmetic number, because the mean of its divisors is an integer number (5651380).

Almost surely, 2^55221828 is an apocalyptic number.

It is an amenable number.

55221828 is an abundant number, since it is smaller than the sum of its proper divisors (80411292).

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

55221828 is a wasteful number, since it uses less digits than its factorization.

55221828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242227 (or 242225 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 55221828 is about 7431.1390782302. The cubic root of 55221828 is about 380.8058337883.

The spelling of 55221828 in words is "fifty-five million, two hundred twenty-one thousand, eight hundred twenty-eight".