25522640 has 160 divisors (see below), whose sum is σ = 73495296. Its totient is φ = 8110080.

The previous prime is 25522631. The next prime is 25522649. The reversal of 25522640 is 4622552.

It is an interprime number because it is at equal distance from previous prime (25522631) and next prime (25522649).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25522649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 263072 + ... + 263168.

Almost surely, 2^25522640 is an apocalyptic number.

25522640 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 25522640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36747648).

25522640 is an abundant number, since it is smaller than the sum of its proper divisors (47972656).

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

25522640 is a wasteful number, since it uses less digits than its factorization.

25522640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 25522640 is about 5051.9936658709. The cubic root of 25522640 is about 294.4253488137.

It can be divided in two parts, 25522 and 640, that added together give a palindrome (26162).

The spelling of 25522640 in words is "twenty-five million, five hundred twenty-two thousand, six hundred forty".