25647920 has 40 divisors (see below), whose sum is σ = 59842896. Its totient is φ = 10222848.

The previous prime is 25647901. The next prime is 25647953. The reversal of 25647920 is 2974652.

It is a tau number, because it is divible by the number of its divisors (40).

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, 41534 + ... + 42146.

Almost surely, 2^25647920 is an apocalyptic number.

25647920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25647920 is an abundant number, since it is smaller than the sum of its proper divisors (34194976).

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

25647920 is a wasteful number, since it uses less digits than its factorization.

25647920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 25647920 is about 5064.3775530661. The cubic root of 25647920 is about 294.9062998402.

The spelling of 25647920 in words is "twenty-five million, six hundred forty-seven thousand, nine hundred twenty".