228656331 has 8 divisors (see below), whose sum is σ = 338750160. Its totient is φ = 152437536.

The previous prime is 228656299. The next prime is 228656333. The reversal of 228656331 is 133656822.

It is a happy number.

It is not a de Polignac number, because 228656331 - 2⁵ = 228656299 is a prime.

It is a super-2 number, since 2×228656331² = 104567435412763122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (228656333) 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, 4234350 + ... + 4234403.

It is an arithmetic number, because the mean of its divisors is an integer number (42343770).

Almost surely, 2^228656331 is an apocalyptic number.

228656331 is a deficient number, since it is larger than the sum of its proper divisors (110093829).

228656331 is an equidigital number, since it uses as much as digits as its factorization.

228656331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8468762 (or 8468756 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 228656331 is about 15121.3865435680. The cubic root of 228656331 is about 611.4971118741.

The spelling of 228656331 in words is "two hundred twenty-eight million, six hundred fifty-six thousand, three hundred thirty-one".