25920440 has 64 divisors (see below), whose sum is σ = 71789760. Its totient is φ = 8202240.

The previous prime is 25920439. The next prime is 25920457. The reversal of 25920440 is 4402952.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80 + ... + 7200.

It is an arithmetic number, because the mean of its divisors is an integer number (1121715).

Almost surely, 2^25920440 is an apocalyptic number.

25920440 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 25920440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35894880).

25920440 is an abundant number, since it is smaller than the sum of its proper divisors (45869320).

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

25920440 is a wasteful number, since it uses less digits than its factorization.

25920440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152 (or 7148 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 25920440 is about 5091.2120364408. The cubic root of 25920440 is about 295.9471234986.

The spelling of 25920440 in words is "twenty-five million, nine hundred twenty thousand, four hundred forty".