25622640 has 120 divisors (see below), whose sum is σ = 90626640. Its totient is φ = 6469632.

The previous prime is 25622633. The next prime is 25622657. The reversal of 25622640 is 4622652.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12744 + ... + 14616.

It is an arithmetic number, because the mean of its divisors is an integer number (755222).

Almost surely, 2^25622640 is an apocalyptic number.

25622640 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 25622640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45313320).

25622640 is an abundant number, since it is smaller than the sum of its proper divisors (65004000).

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

25622640 is a wasteful number, since it uses less digits than its factorization.

25622640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 25622640 is about 5061.8810732770. The cubic root of 25622640 is about 294.8093760346.

It can be divided in two parts, 25622 and 640, that added together give a palindrome (26262).

The spelling of 25622640 in words is "twenty-five million, six hundred twenty-two thousand, six hundred forty".