25220440 has 32 divisors (see below), whose sum is σ = 64853280. Its totient is φ = 8646912.

The previous prime is 25220431. The next prime is 25220449. The reversal of 25220440 is 4402252.

It is an interprime number because it is at equal distance from previous prime (25220431) and next prime (25220449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220449) 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, 44757 + ... + 45316.

It is an arithmetic number, because the mean of its divisors is an integer number (2026665).

Almost surely, 2^25220440 is an apocalyptic number.

25220440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25220440 is an abundant number, since it is smaller than the sum of its proper divisors (39632840).

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

25220440 is a wasteful number, since it uses less digits than its factorization.

25220440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90091 (or 90087 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 25220440 is about 5021.9956192733. The cubic root of 25220440 is about 293.2586873881.

Adding to 25220440 its reverse (4402252), we get a palindrome (29622692).

The spelling of 25220440 in words is "twenty-five million, two hundred twenty thousand, four hundred forty".