22456640 has 28 divisors (see below), whose sum is σ = 53475636. Its totient is φ = 8982528.

The previous prime is 22456633. The next prime is 22456649. The reversal of 22456640 is 4665422.

It can be written as a sum of positive squares in 2 ways, for example, as 3655744 + 18800896 = 1912^2 + 4336^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22456649) 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, 34769 + ... + 35408.

Almost surely, 2^22456640 is an apocalyptic number.

22456640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22456640 is an abundant number, since it is smaller than the sum of its proper divisors (31018996).

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

22456640 is an equidigital number, since it uses as much as digits as its factorization.

22456640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70194 (or 70184 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 22456640 is about 4738.8437408296. The cubic root of 22456640 is about 282.1293439481.

The spelling of 22456640 in words is "twenty-two million, four hundred fifty-six thousand, six hundred forty".