25509696 has 28 divisors (see below), whose sum is σ = 67494912. Its totient is φ = 8503168.

The previous prime is 25509643. The next prime is 25509709. The reversal of 25509696 is 69690552.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 66240 + ... + 66623.

Almost surely, 2^25509696 is an apocalyptic number.

It is an amenable number.

25509696 is an abundant number, since it is smaller than the sum of its proper divisors (41985216).

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

25509696 is a wasteful number, since it uses less digits than its factorization.

25509696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132878 (or 132868 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 42.

The square root of 25509696 is about 5050.7124249951. The cubic root of 25509696 is about 294.3755670492.

It can be divided in two parts, 2550 and 9696, that added together give a triangular number (12246 = T₁₅₆).

The spelling of 25509696 in words is "twenty-five million, five hundred nine thousand, six hundred ninety-six".