25999956 has 36 divisors (see below), whose sum is σ = 65901472. Its totient is φ = 8643024.

The previous prime is 25999949. The next prime is 26000003. The reversal of 25999956 is 65999952.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16791 + ... + 18273.

Almost surely, 2^25999956 is an apocalyptic number.

It is an amenable number.

25999956 is an abundant number, since it is smaller than the sum of its proper divisors (39901516).

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

25999956 is a wasteful number, since it uses less digits than its factorization.

25999956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1975 counting only the distinct ones).

The product of its digits is 1968300, while the sum is 54.

The square root of 25999956 is about 5099.0151990360. The cubic root of 25999956 is about 296.2494397255.

The spelling of 25999956 in words is "twenty-five million, nine hundred ninety-nine thousand, nine hundred fifty-six".