25690656 has 24 divisors (see below), whose sum is σ = 67438224. Its totient is φ = 8563520.

The previous prime is 25690649. The next prime is 25690657. The reversal of 25690656 is 65609652.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (25690657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133710 + ... + 133901.

It is an arithmetic number, because the mean of its divisors is an integer number (2809926).

Almost surely, 2^25690656 is an apocalyptic number.

It is an amenable number.

25690656 is an abundant number, since it is smaller than the sum of its proper divisors (41747568).

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

25690656 is a wasteful number, since it uses less digits than its factorization.

25690656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267624 (or 267616 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 25690656 is about 5068.5950716150. The cubic root of 25690656 is about 295.0700054103.

The spelling of 25690656 in words is "twenty-five million, six hundred ninety thousand, six hundred fifty-six".