228454640 has 20 divisors (see below), whose sum is σ = 531157224. Its totient is φ = 91381824.

The previous prime is 228454637. The next prime is 228454673. The reversal of 228454640 is 46454822.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 228454640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1427762 + ... + 1427921.

Almost surely, 2^228454640 is an apocalyptic number.

228454640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228454640 is an abundant number, since it is smaller than the sum of its proper divisors (302702584).

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

228454640 is a wasteful number, since it uses less digits than its factorization.

228454640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855696 (or 2855690 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The square root of 228454640 is about 15114.7160079176. The cubic root of 228454640 is about 611.3172644670.

The spelling of 228454640 in words is "two hundred twenty-eight million, four hundred fifty-four thousand, six hundred forty".