228665724 has 96 divisors (see below), whose sum is σ = 645636096. Its totient is φ = 61575360.

The previous prime is 228665719. The next prime is 228665777. The reversal of 228665724 is 427566822.

228665724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136339 + ... + 138005.

It is an arithmetic number, because the mean of its divisors is an integer number (6725376).

Almost surely, 2^228665724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228665724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322818048).

228665724 is an abundant number, since it is smaller than the sum of its proper divisors (416970372).

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

228665724 is a wasteful number, since it uses less digits than its factorization.

228665724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1775 (or 1773 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 228665724 is about 15121.6971269762. The cubic root of 228665724 is about 611.5054850130.

The spelling of 228665724 in words is "two hundred twenty-eight million, six hundred sixty-five thousand, seven hundred twenty-four".