22152640 has 56 divisors (see below), whose sum is σ = 54205632. Its totient is φ = 8616960.

The previous prime is 22152601. The next prime is 22152643. The reversal of 22152640 is 4625122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22152643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10905 + ... + 12775.

Almost surely, 2^22152640 is an apocalyptic number.

22152640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22152640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27102816).

22152640 is an abundant number, since it is smaller than the sum of its proper divisors (32052992).

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

22152640 is a wasteful number, since it uses less digits than its factorization.

22152640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925 (or 1915 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 22152640 is about 4706.6591123641. The cubic root of 22152640 is about 280.8504753649.

Adding to 22152640 its reverse (4625122), we get a palindrome (26777762).

The spelling of 22152640 in words is "twenty-two million, one hundred fifty-two thousand, six hundred forty".