228708440 has 32 divisors (see below), whose sum is σ = 519698160. Its totient is φ = 90576000.

The previous prime is 228708427. The next prime is 228708451. The reversal of 228708440 is 44807822.

It is a self number, because there is not a number n which added to its sum of digits gives 228708440.

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, 24266 + ... + 32345.

Almost surely, 2^228708440 is an apocalyptic number.

228708440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228708440 is an abundant number, since it is smaller than the sum of its proper divisors (290989720).

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

228708440 is a wasteful number, since it uses less digits than its factorization.

228708440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56723 (or 56719 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 228708440 is about 15123.1094686245. The cubic root of 228708440 is about 611.5435601583.

The spelling of 228708440 in words is "two hundred twenty-eight million, seven hundred eight thousand, four hundred forty".