25880640 has 56 divisors (see below), whose sum is σ = 82174080. Its totient is φ = 6901248.

The previous prime is 25880639. The next prime is 25880663. The reversal of 25880640 is 4608852.

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, 12520 + ... + 14439.

Almost surely, 2^25880640 is an apocalyptic number.

25880640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25880640 is an abundant number, since it is smaller than the sum of its proper divisors (56293440).

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

25880640 is a wasteful number, since it uses less digits than its factorization.

25880640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26979 (or 26969 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 25880640 is about 5087.3018388926. The cubic root of 25880640 is about 295.7955734829.

The spelling of 25880640 in words is "twenty-five million, eight hundred eighty thousand, six hundred forty".