22878440 has 32 divisors (see below), whose sum is σ = 55437480. Its totient is φ = 8447232.

The previous prime is 22878439. The next prime is 22878467. The reversal of 22878440 is 4487822.

It can be written as a sum of positive squares in 4 ways, for example, as 11195716 + 11682724 = 3346^2 + 3418^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 22878440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21479 + ... + 22518.

Almost surely, 2^22878440 is an apocalyptic number.

22878440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22878440 is an abundant number, since it is smaller than the sum of its proper divisors (32559040).

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

22878440 is a wasteful number, since it uses less digits than its factorization.

22878440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44021 (or 44017 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 22878440 is about 4783.1412272690. The cubic root of 22878440 is about 283.8847975522.

The spelling of 22878440 in words is "twenty-two million, eight hundred seventy-eight thousand, four hundred forty".