25331664 has 40 divisors (see below), whose sum is σ = 66370752. Its totient is φ = 8323840.

The previous prime is 25331659. The next prime is 25331699. The reversal of 25331664 is 46613352.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

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, 309 + ... + 7124.

Almost surely, 2^25331664 is an apocalyptic number.

25331664 is a gapful number since it is divisible by the number (24) 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 25331664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33185376).

25331664 is an abundant number, since it is smaller than the sum of its proper divisors (41039088).

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

25331664 is a wasteful number, since it uses less digits than its factorization.

25331664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7515 (or 7509 counting only the distinct ones).

The product of its digits is 12960, while the sum is 30.

The square root of 25331664 is about 5033.0571226641. The cubic root of 25331664 is about 293.6891526905.

The spelling of 25331664 in words is "twenty-five million, three hundred thirty-one thousand, six hundred sixty-four".