25749009 has 84 divisors (see below), whose sum is σ = 48004560. Its totient is φ = 13646880.

The previous prime is 25749001. The next prime is 25749019. The reversal of 25749009 is 90094752.

It is not a de Polignac number, because 25749009 - 2³ = 25749001 is a prime.

It is a super-2 number, since 2×25749009² = 1326022928964162, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25749001) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 1355202 + ... + 1355220.

Almost surely, 2^25749009 is an apocalyptic number.

It is an amenable number.

25749009 is a deficient number, since it is larger than the sum of its proper divisors (22255551).

25749009 is a wasteful number, since it uses less digits than its factorization.

25749009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 25749009 is about 5074.3481354751. The cubic root of 25749009 is about 295.2932409209.

The spelling of 25749009 in words is "twenty-five million, seven hundred forty-nine thousand, nine".