25509975 has 24 divisors (see below), whose sum is σ = 42497280. Its totient is φ = 13501920.

The previous prime is 25509971. The next prime is 25509997. The reversal of 25509975 is 57990552.

It is not a de Polignac number, because 25509975 - 2² = 25509971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9202 + ... + 11648.

It is an arithmetic number, because the mean of its divisors is an integer number (1770720).

Almost surely, 2^25509975 is an apocalyptic number.

25509975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25509975 is a deficient number, since it is larger than the sum of its proper divisors (16987305).

25509975 is a wasteful number, since it uses less digits than its factorization.

25509975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599 (or 2594 counting only the distinct ones).

The product of its (nonzero) digits is 141750, while the sum is 42.

The square root of 25509975 is about 5050.7400447855. The cubic root of 25509975 is about 294.3766402422.

The spelling of 25509975 in words is "twenty-five million, five hundred nine thousand, nine hundred seventy-five".