228856821 has 8 divisors (see below), whose sum is σ = 305362560. Its totient is φ = 152461152.

The previous prime is 228856819. The next prime is 228856829. The reversal of 228856821 is 128658822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228856821 - 2¹ = 228856819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228856829) 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, 22536 + ... + 31073.

It is an arithmetic number, because the mean of its divisors is an integer number (38170320).

Almost surely, 2^228856821 is an apocalyptic number.

It is an amenable number.

228856821 is a deficient number, since it is larger than the sum of its proper divisors (76505739).

228856821 is a wasteful number, since it uses less digits than its factorization.

228856821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55035.

The product of its digits is 122880, while the sum is 42.

The square root of 228856821 is about 15128.0144434093. The cubic root of 228856821 is about 611.6757835666.

The spelling of 228856821 in words is "two hundred twenty-eight million, eight hundred fifty-six thousand, eight hundred twenty-one".