25649760 has 48 divisors (see below), whose sum is σ = 80798256. Its totient is φ = 6839808.

The previous prime is 25649749. The next prime is 25649777. The reversal of 25649760 is 6794652.

It is a tau number, because it is divible by the number of its divisors (48).

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, 26239 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (1683297).

Almost surely, 2^25649760 is an apocalyptic number.

25649760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25649760 is an abundant number, since it is smaller than the sum of its proper divisors (55148496).

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

25649760 is a wasteful number, since it uses less digits than its factorization.

25649760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53455 (or 53447 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 25649760 is about 5064.5592108297. The cubic root of 25649760 is about 294.9133519340.

The spelling of 25649760 in words is "twenty-five million, six hundred forty-nine thousand, seven hundred sixty".