228463440 has 80 divisors (see below), whose sum is σ = 710127168. Its totient is φ = 60761088.

The previous prime is 228463423. The next prime is 228463441. The reversal of 228463440 is 44364822.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228463441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108639 + ... + 110721.

Almost surely, 2^228463440 is an apocalyptic number.

228463440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228463440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355063584).

228463440 is an abundant number, since it is smaller than the sum of its proper divisors (481663728).

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

228463440 is a wasteful number, since it uses less digits than its factorization.

228463440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556 (or 2550 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 33.

The square root of 228463440 is about 15115.0071121386. The cubic root of 228463440 is about 611.3251136150.

The spelling of 228463440 in words is "two hundred twenty-eight million, four hundred sixty-three thousand, four hundred forty".