228521240 has 32 divisors (see below), whose sum is σ = 514712880. Its totient is φ = 91312512.

The previous prime is 228521231. The next prime is 228521263. The reversal of 228521240 is 42125822.

It is a super-2 number, since 2×228521240² = 104443914262275200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45074 + ... + 49886.

Almost surely, 2^228521240 is an apocalyptic number.

228521240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228521240 is an abundant number, since it is smaller than the sum of its proper divisors (286191640).

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

228521240 is a wasteful number, since it uses less digits than its factorization.

228521240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6011 (or 6007 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 228521240 is about 15116.9189982615. The cubic root of 228521240 is about 611.3766632374.

The spelling of 228521240 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, two hundred forty".