228288621 has 16 divisors (see below), whose sum is σ = 333734400. Its totient is φ = 137657520.

The previous prime is 228288611. The next prime is 228288623. The reversal of 228288621 is 126882822.

It is not a de Polignac number, because 228288621 - 2¹⁴ = 228272237 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 228288621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228288623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10815 + ... + 23948.

It is an arithmetic number, because the mean of its divisors is an integer number (20858400).

Almost surely, 2^228288621 is an apocalyptic number.

It is an amenable number.

228288621 is a deficient number, since it is larger than the sum of its proper divisors (105445779).

228288621 is a wasteful number, since it uses less digits than its factorization.

228288621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34976.

The product of its digits is 49152, while the sum is 39.

The square root of 228288621 is about 15109.2230442204. The cubic root of 228288621 is about 611.1691462595.

The spelling of 228288621 in words is "two hundred twenty-eight million, two hundred eighty-eight thousand, six hundred twenty-one".