228763621 has 4 divisors (see below), whose sum is σ = 228861612. Its totient is φ = 228665632.

The previous prime is 228763607. The next prime is 228763643. The reversal of 228763621 is 126367822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 226171521 = 1610^2 + 15039^2 .

It is a cyclic number.

It is not a de Polignac number, because 228763621 - 2²¹ = 226666469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228763651) 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, 45406 + ... + 50191.

It is an arithmetic number, because the mean of its divisors is an integer number (57215403).

Almost surely, 2^228763621 is an apocalyptic number.

It is an amenable number.

228763621 is a deficient number, since it is larger than the sum of its proper divisors (97991).

228763621 is an equidigital number, since it uses as much as digits as its factorization.

228763621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97990.

The product of its digits is 48384, while the sum is 37.

The square root of 228763621 is about 15124.9337519210. The cubic root of 228763621 is about 611.5927390336.

The spelling of 228763621 in words is "two hundred twenty-eight million, seven hundred sixty-three thousand, six hundred twenty-one".