228557220 has 96 divisors (see below), whose sum is σ = 653159808. Its totient is φ = 59707392.

The previous prime is 228557113. The next prime is 228557227. The reversal of 228557220 is 22755822.

228557220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (228557227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1006747 + ... + 1006973.

It is an arithmetic number, because the mean of its divisors is an integer number (6803748).

Almost surely, 2^228557220 is an apocalyptic number.

228557220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228557220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326579904).

228557220 is an abundant number, since it is smaller than the sum of its proper divisors (424602588).

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

228557220 is a wasteful number, since it uses less digits than its factorization.

228557220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 228557220 is about 15118.1090087352. The cubic root of 228557220 is about 611.4087480419.

The spelling of 228557220 in words is "two hundred twenty-eight million, five hundred fifty-seven thousand, two hundred twenty".