25440320 has 56 divisors (see below), whose sum is σ = 61228224. Its totient is φ = 10067456.

The previous prime is 25440319. The next prime is 25440341. The reversal of 25440320 is 2304452.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 25440292 and 25440301.

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, 33869 + ... + 34611.

Almost surely, 2^25440320 is an apocalyptic number.

25440320 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 25440320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30614112).

25440320 is an abundant number, since it is smaller than the sum of its proper divisors (35787904).

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

25440320 is a wasteful number, since it uses less digits than its factorization.

25440320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 25440320 is about 5043.8398071311. The cubic root of 25440320 is about 294.1084641525.

Adding to 25440320 its reverse (2304452), we get a palindrome (27744772).

The spelling of 25440320 in words is "twenty-five million, four hundred forty thousand, three hundred twenty".