25605680 has 40 divisors (see below), whose sum is σ = 59808672. Its totient is φ = 10194944.

The previous prime is 25605677. The next prime is 25605691. The reversal of 25605680 is 8650652.

It is a happy number.

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

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 7 ways as a sum of consecutive naturals, for example, 20432 + ... + 21648.

Almost surely, 2^25605680 is an apocalyptic number.

25605680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25605680 is an abundant number, since it is smaller than the sum of its proper divisors (34202992).

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

25605680 is a wasteful number, since it uses less digits than its factorization.

25605680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493 (or 1487 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 25605680 is about 5060.2055294227. The cubic root of 25605680 is about 294.7443154657.

The spelling of 25605680 in words is "twenty-five million, six hundred five thousand, six hundred eighty".