25440660 has 144 divisors (see below), whose sum is σ = 89910912. Its totient is φ = 5702400.

The previous prime is 25440659. The next prime is 25440661. The reversal of 25440660 is 6604452.

It is a happy number.

25440660 is a `hidden beast` number, since 254 + 406 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (25440659) and next prime (25440661).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25440661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76695 + ... + 77025.

Almost surely, 2^25440660 is an apocalyptic number.

25440660 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 25440660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44955456).

25440660 is an abundant number, since it is smaller than the sum of its proper divisors (64470252).

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

25440660 is a wasteful number, since it uses less digits than its factorization.

25440660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 25440660 is about 5043.8735114989. The cubic root of 25440660 is about 294.1097743618.

The spelling of 25440660 in words is "twenty-five million, four hundred forty thousand, six hundred sixty".