228021756 has 24 divisors (see below), whose sum is σ = 533011584. Its totient is φ = 75870000.

The previous prime is 228021749. The next prime is 228021767. The reversal of 228021756 is 657120822.

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, 10120 + ... + 23631.

It is an arithmetic number, because the mean of its divisors is an integer number (22208816).

Almost surely, 2^228021756 is an apocalyptic number.

It is an amenable number.

228021756 is an abundant number, since it is smaller than the sum of its proper divisors (304989828).

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

228021756 is a wasteful number, since it uses less digits than its factorization.

228021756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34321 (or 34319 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 228021756 is about 15100.3892665057. The cubic root of 228021756 is about 610.9309050829.

The spelling of 228021756 in words is "two hundred twenty-eight million, twenty-one thousand, seven hundred fifty-six".