25640525 has 6 divisors (see below), whose sum is σ = 31794282. Its totient is φ = 20512400.

The previous prime is 25640501. The next prime is 25640543. The reversal of 25640525 is 52504652.

It can be written as a sum of positive squares in 3 ways, for example, as 259081 + 25381444 = 509^2 + 5038^2 .

It is not a de Polignac number, because 25640525 - 2⁸ = 25640269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 512786 + ... + 512835.

It is an arithmetic number, because the mean of its divisors is an integer number (5299047).

Almost surely, 2^25640525 is an apocalyptic number.

25640525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25640525 is a deficient number, since it is larger than the sum of its proper divisors (6153757).

25640525 is a wasteful number, since it uses less digits than its factorization.

25640525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025631 (or 1025626 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 25640525 is about 5063.6474008367. The cubic root of 25640525 is about 294.8779539195.

The spelling of 25640525 in words is "twenty-five million, six hundred forty thousand, five hundred twenty-five".