25664920 has 16 divisors (see below), whose sum is σ = 57746160. Its totient is φ = 10265952.

The previous prime is 25664887. The next prime is 25664923. The reversal of 25664920 is 2946652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320772 + ... + 320851.

It is an arithmetic number, because the mean of its divisors is an integer number (3609135).

Almost surely, 2^25664920 is an apocalyptic number.

25664920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25664920 is an abundant number, since it is smaller than the sum of its proper divisors (32081240).

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

25664920 is a wasteful number, since it uses less digits than its factorization.

25664920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641634 (or 641630 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 25664920 is about 5066.0556649133. The cubic root of 25664920 is about 294.9714422226.

The spelling of 25664920 in words is "twenty-five million, six hundred sixty-four thousand, nine hundred twenty".