22758640 has 20 divisors (see below), whose sum is σ = 52914024. Its totient is φ = 9103424.

The previous prime is 22758629. The next prime is 22758641. The reversal of 22758640 is 4685722.

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

It is a junction number, because it is equal to n+sod(n) for n = 22758596 and 22758605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22758641) 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, 142162 + ... + 142321.

Almost surely, 2^22758640 is an apocalyptic number.

22758640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22758640 is an abundant number, since it is smaller than the sum of its proper divisors (30155384).

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

22758640 is a wasteful number, since it uses less digits than its factorization.

22758640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284496 (or 284490 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 22758640 is about 4770.6016392065. The cubic root of 22758640 is about 283.3884214301.

The spelling of 22758640 in words is "twenty-two million, seven hundred fifty-eight thousand, six hundred forty".