228990640 has 40 divisors (see below), whose sum is σ = 535197888. Its totient is φ = 91115520.

The previous prime is 228990631. The next prime is 228990661. The reversal of 228990640 is 46099822.

228990640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 228990593 and 228990602.

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, 8025 + ... + 22855.

Almost surely, 2^228990640 is an apocalyptic number.

228990640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228990640 is an abundant number, since it is smaller than the sum of its proper divisors (306207248).

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

228990640 is a wasteful number, since it uses less digits than its factorization.

228990640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15037 (or 15031 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 228990640 is about 15132.4366841563. The cubic root of 228990640 is about 611.7949816638.

It can be divided in two parts, 2289 and 90640, that added together give a palindrome (92929).

The spelling of 228990640 in words is "two hundred twenty-eight million, nine hundred ninety thousand, six hundred forty".