22944640 has 32 divisors (see below), whose sum is σ = 54853560. Its totient is φ = 9177600.

The previous prime is 22944637. The next prime is 22944641. The reversal of 22944640 is 4644922.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22944641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17286 + ... + 18565.

Almost surely, 2^22944640 is an apocalyptic number.

22944640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22944640 is an abundant number, since it is smaller than the sum of its proper divisors (31908920).

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

22944640 is an equidigital number, since it uses as much as digits as its factorization.

22944640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35870 (or 35858 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 22944640 is about 4790.0563671005. The cubic root of 22944640 is about 284.1583458700.

The spelling of 22944640 in words is "twenty-two million, nine hundred forty-four thousand, six hundred forty".