228621718138564 has 27 divisors (see below), whose sum is σ = 425007938631367. Its totient is φ = 107586448964864.

The previous prime is 228621718138559. The next prime is 228621718138601. The reversal of 228621718138564 is 465831817126822.

The square root of 228621718138564 is 15120242.

It is a perfect power (a square), and thus also a powerful number.

228621718138564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3499301492164 + 225122416646400 = 1870642^2 + 15004080^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228621718138496 and 228621718138505.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 513865872 + ... + 514310584.

Almost surely, 2^{228621718138564} is an apocalyptic number.

228621718138564 is the 15120242-nd square number.

It is an amenable number.

228621718138564 is a deficient number, since it is larger than the sum of its proper divisors (196386220492803).

228621718138564 is an frugal number, since it uses more digits than its factorization.

228621718138564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889464 (or 444732 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 64.

The spelling of 228621718138564 in words is "two hundred twenty-eight trillion, six hundred twenty-one billion, seven hundred eighteen million, one hundred thirty-eight thousand, five hundred sixty-four".