25649568 has 96 divisors (see below), whose sum is σ = 85518720. Its totient is φ = 7326720.

The previous prime is 25649557. The next prime is 25649587. The reversal of 25649568 is 86594652.

25649568 is a `hidden beast` number, since 25 + 64 + 9 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3928 + ... + 8168.

It is an arithmetic number, because the mean of its divisors is an integer number (890820).

Almost surely, 2^25649568 is an apocalyptic number.

25649568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25649568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42759360).

25649568 is an abundant number, since it is smaller than the sum of its proper divisors (59869152).

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

25649568 is a wasteful number, since it uses less digits than its factorization.

25649568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267 (or 4253 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 25649568 is about 5064.5402555415. The cubic root of 25649568 is about 294.9126160791.

The spelling of 25649568 in words is "twenty-five million, six hundred forty-nine thousand, five hundred sixty-eight".