25523440 has 40 divisors (see below), whose sum is σ = 59906880. Its totient is φ = 10112256.

The previous prime is 25523429. The next prime is 25523453. The reversal of 25523440 is 4432552.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7257 + ... + 10183.

It is an arithmetic number, because the mean of its divisors is an integer number (1497672).

Almost surely, 2^25523440 is an apocalyptic number.

25523440 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 25523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29953440).

25523440 is an abundant number, since it is smaller than the sum of its proper divisors (34383440).

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

25523440 is a wasteful number, since it uses less digits than its factorization.

25523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3049 (or 3043 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 25523440 is about 5052.0728419135. The cubic root of 25523440 is about 294.4284250082.

Adding to 25523440 its reverse (4432552), we get a palindrome (29955992).

The spelling of 25523440 in words is "twenty-five million, five hundred twenty-three thousand, four hundred forty".