228121756 has 12 divisors (see below), whose sum is σ = 400359400. Its totient is φ = 113733360.

The previous prime is 228121741. The next prime is 228121757. The reversal of 228121756 is 657121822.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228121757) 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, 80310 + ... + 83101.

Almost surely, 2^228121756 is an apocalyptic number.

It is an amenable number.

228121756 is a deficient number, since it is larger than the sum of its proper divisors (172237644).

228121756 is a wasteful number, since it uses less digits than its factorization.

228121756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163764 (or 163762 counting only the distinct ones).

The product of its digits is 13440, while the sum is 34.

The square root of 228121756 is about 15103.7000764713. The cubic root of 228121756 is about 611.0202008923.

The spelling of 228121756 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, seven hundred fifty-six".