228205440 has 96 divisors (see below), whose sum is σ = 788041800. Its totient is φ = 60853248.

The previous prime is 228205403. The next prime is 228205441. The reversal of 228205440 is 44502822.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228205441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14050 + ... + 25569.

Almost surely, 2^228205440 is an apocalyptic number.

228205440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228205440 is an abundant number, since it is smaller than the sum of its proper divisors (559836360).

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

228205440 is a wasteful number, since it uses less digits than its factorization.

228205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39644 (or 39629 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 228205440 is about 15106.4701369976. The cubic root of 228205440 is about 611.0949071430.

The spelling of 228205440 in words is "two hundred twenty-eight million, two hundred five thousand, four hundred forty".