228438440 has 16 divisors (see below), whose sum is σ = 513986580. Its totient is φ = 91375360.

The previous prime is 228438433. The next prime is 228438451. The reversal of 228438440 is 44834822.

228438440 = 2158² + 2159² + ... + 2205².

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 203975524 + 24462916 = 14282^2 + 4946^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 228438440.

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, 2855441 + ... + 2855520.

Almost surely, 2^228438440 is an apocalyptic number.

228438440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228438440 is an abundant number, since it is smaller than the sum of its proper divisors (285548140).

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

228438440 is a wasteful number, since it uses less digits than its factorization.

228438440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5710972 (or 5710968 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 35.

The square root of 228438440 is about 15114.1800968494. The cubic root of 228438440 is about 611.3028143720.

The spelling of 228438440 in words is "two hundred twenty-eight million, four hundred thirty-eight thousand, four hundred forty".