22782640 has 20 divisors (see below), whose sum is σ = 52969824. Its totient is φ = 9113024.

The previous prime is 22782623. The next prime is 22782649. The reversal of 22782640 is 4628722.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (22782649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142312 + ... + 142471.

Almost surely, 2^22782640 is an apocalyptic number.

22782640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22782640 is an abundant number, since it is smaller than the sum of its proper divisors (30187184).

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

22782640 is a wasteful number, since it uses less digits than its factorization.

22782640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284796 (or 284790 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 22782640 is about 4773.1163824068. The cubic root of 22782640 is about 283.4880016737.

The spelling of 22782640 in words is "twenty-two million, seven hundred eighty-two thousand, six hundred forty".