228212440 has 32 divisors (see below), whose sum is σ = 535805280. Its totient is φ = 87315712.

The previous prime is 228212419. The next prime is 228212443. The reversal of 228212440 is 44212822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228212443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123109 + ... + 124948.

It is an arithmetic number, because the mean of its divisors is an integer number (16743915).

Almost surely, 2^228212440 is an apocalyptic number.

228212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228212440 is an abundant number, since it is smaller than the sum of its proper divisors (307592840).

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

228212440 is a wasteful number, since it uses less digits than its factorization.

228212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248091 (or 248087 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 228212440 is about 15106.7018240250. The cubic root of 228212440 is about 611.1011553444.

The spelling of 228212440 in words is "two hundred twenty-eight million, two hundred twelve thousand, four hundred forty".