25667664 has 80 divisors (see below), whose sum is σ = 73013184. Its totient is φ = 7705600.

The previous prime is 25667627. The next prime is 25667683. The reversal of 25667664 is 46676652.

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, 91204 + ... + 91484.

Almost surely, 2^25667664 is an apocalyptic number.

25667664 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 25667664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36506592).

25667664 is an abundant number, since it is smaller than the sum of its proper divisors (47345520).

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

25667664 is a wasteful number, since it uses less digits than its factorization.

25667664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 470 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 25667664 is about 5066.3264798076. The cubic root of 25667664 is about 294.9819542729.

The spelling of 25667664 in words is "twenty-five million, six hundred sixty-seven thousand, six hundred sixty-four".