22278040 has 32 divisors (see below), whose sum is σ = 50355360. Its totient is φ = 8870400.

The previous prime is 22278037. The next prime is 22278071. The reversal of 22278040 is 4087222.

It is a super-2 number, since 2×22278040² = 992622132483200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 22277996 and 22278014.

It is a congruent number.

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, 8485 + ... + 10795.

It is an arithmetic number, because the mean of its divisors is an integer number (1573605).

Almost surely, 2^22278040 is an apocalyptic number.

22278040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22278040 is an abundant number, since it is smaller than the sum of its proper divisors (28077320).

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

22278040 is a wasteful number, since it uses less digits than its factorization.

22278040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2563 (or 2559 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 22278040 is about 4719.9618642527. The cubic root of 22278040 is about 281.3794176408.

The spelling of 22278040 in words is "twenty-two million, two hundred seventy-eight thousand, forty".