22372640 has 48 divisors (see below), whose sum is σ = 53669952. Its totient is φ = 8811264.

The previous prime is 22372627. The next prime is 22372643. The reversal of 22372640 is 4627322.

It is not an unprimeable number, because it can be changed into a prime (22372643) 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, 9677 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (1118124).

Almost surely, 2^22372640 is an apocalyptic number.

22372640 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 22372640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26834976).

22372640 is an abundant number, since it is smaller than the sum of its proper divisors (31297312).

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

22372640 is a wasteful number, since it uses less digits than its factorization.

22372640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169 (or 2161 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 22372640 is about 4729.9725157764. The cubic root of 22372640 is about 281.7771322293. Note that the first 3 decimals are identical.

Adding to 22372640 its reverse (4627322), we get a palindrome (26999962).

The spelling of 22372640 in words is "twenty-two million, three hundred seventy-two thousand, six hundred forty".