25641025 has 6 divisors (see below), whose sum is σ = 31794902. Its totient is φ = 20512800.

The previous prime is 25640983. The next prime is 25641047. The reversal of 25641025 is 52014652.

It can be written as a sum of positive squares in 3 ways, for example, as 7056 + 25633969 = 84^2 + 5063^2 .

It is not a de Polignac number, because 25641025 - 2¹⁹ = 25116737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 1025641 = 25641025 / (2 + 5 + 6 + 4 + 1 + 0 + 2 + 5).

It is a Duffinian number.

25641025 is a modest number, since divided by 641025 gives 25 as remainder.

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, 512796 + ... + 512845.

Almost surely, 2^25641025 is an apocalyptic number.

25641025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25641025 is a deficient number, since it is larger than the sum of its proper divisors (6153877).

25641025 is a wasteful number, since it uses less digits than its factorization.

25641025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025651 (or 1025646 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 25641025 is about 5063.6967721221. The cubic root of 25641025 is about 294.8798706511.

Adding to 25641025 its reverse (52014652), we get a palindrome (77655677).

The spelling of 25641025 in words is "twenty-five million, six hundred forty-one thousand, twenty-five".