22615040 has 88 divisors (see below), whose sum is σ = 62097792. Its totient is φ = 7741440.

The previous prime is 22615013. The next prime is 22615051. The reversal of 22615040 is 4051622.

It is a happy number.

It is a super-2 number, since 2×22615040² = 1022880068403200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35525 + ... + 36155.

Almost surely, 2^22615040 is an apocalyptic number.

22615040 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 22615040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31048896).

22615040 is an abundant number, since it is smaller than the sum of its proper divisors (39482752).

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

22615040 is an equidigital number, since it uses as much as digits as its factorization.

22615040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 645 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 22615040 is about 4755.5273104042. The cubic root of 22615040 is about 282.7911322440.

Adding to 22615040 its reverse (4051622), we get a palindrome (26666662).

The spelling of 22615040 in words is "twenty-two million, six hundred fifteen thousand, forty".