228137628 has 12 divisors (see below), whose sum is σ = 532321160. Its totient is φ = 76045872.

The previous prime is 228137627. The next prime is 228137633. The reversal of 228137628 is 826731822.

228137628 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228137627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9505723 + ... + 9505746.

Almost surely, 2^228137628 is an apocalyptic number.

It is an amenable number.

228137628 is an abundant number, since it is smaller than the sum of its proper divisors (304183532).

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

228137628 is a wasteful number, since it uses less digits than its factorization.

228137628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19011476 (or 19011474 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 228137628 is about 15104.2255014946. The cubic root of 228137628 is about 611.0343715234.

The spelling of 228137628 in words is "two hundred twenty-eight million, one hundred thirty-seven thousand, six hundred twenty-eight".