228521502 has 48 divisors (see below), whose sum is σ = 542496240. Its totient is φ = 68947200.

The previous prime is 228521477. The next prime is 228521519. The reversal of 228521502 is 205125822.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45324 + ... + 50112.

It is an arithmetic number, because the mean of its divisors is an integer number (11302005).

Almost surely, 2^228521502 is an apocalyptic number.

228521502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 228521502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271248120).

228521502 is an abundant number, since it is smaller than the sum of its proper divisors (313974738).

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

228521502 is a wasteful number, since it uses less digits than its factorization.

228521502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049 (or 5046 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 228521502 is about 15116.9276640460. The cubic root of 228521502 is about 611.3768968854.

The spelling of 228521502 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, five hundred two".