25649925 has 24 divisors (see below), whose sum is σ = 48467136. Its totient is φ = 11725440.

The previous prime is 25649909. The next prime is 25649929. The reversal of 25649925 is 52994652.

It is not a de Polignac number, because 25649925 - 2⁴ = 25649909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25649929) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 23904 + ... + 24953.

It is an arithmetic number, because the mean of its divisors is an integer number (2019464).

Almost surely, 2^25649925 is an apocalyptic number.

25649925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25649925 is a deficient number, since it is larger than the sum of its proper divisors (22817211).

25649925 is a wasteful number, since it uses less digits than its factorization.

25649925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48877 (or 48872 counting only the distinct ones).

The product of its digits is 194400, while the sum is 42.

The square root of 25649925 is about 5064.5755004739. The cubic root of 25649925 is about 294.9139843064.

The spelling of 25649925 in words is "twenty-five million, six hundred forty-nine thousand, nine hundred twenty-five".