25640704 has 36 divisors (see below), whose sum is σ = 52583944. Its totient is φ = 12469248.

The previous prime is 25640683. The next prime is 25640729. The reversal of 25640704 is 40704652.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8119 + ... + 10825.

Almost surely, 2^25640704 is an apocalyptic number.

25640704 is the 2707-th nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25640704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26291972).

25640704 is an abundant number, since it is smaller than the sum of its proper divisors (26943240).

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

25640704 is an equidigital number, since it uses as much as digits as its factorization.

25640704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 25640704 is about 5063.6650758122. The cubic root of 25640704 is about 294.8786401123.

The spelling of 25640704 in words is "twenty-five million, six hundred forty thousand, seven hundred four".