25669440 has 112 divisors (see below), whose sum is σ = 90586560. Its totient is φ = 6842880.

The previous prime is 25669433. The next prime is 25669451. The reversal of 25669440 is 4496652.

25669440 is a `hidden beast` number, since 2 + 566 + 94 + 4 + 0 = 666.

It is a super-3 number, since 3×25669440³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25669395 and 25669404.

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, 7155 + ... + 10125.

Almost surely, 2^25669440 is an apocalyptic number.

25669440 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 25669440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45293280).

25669440 is an abundant number, since it is smaller than the sum of its proper divisors (64917120).

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

25669440 is a wasteful number, since it uses less digits than its factorization.

25669440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997 (or 2981 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 25669440 is about 5066.5017517021. The cubic root of 25669440 is about 294.9887575913.

It can be divided in two parts, 256 and 69440, that added together give a palindrome (69696).

The spelling of 25669440 in words is "twenty-five million, six hundred sixty-nine thousand, four hundred forty".