25640275 has 6 divisors (see below), whose sum is σ = 31793972. Its totient is φ = 20512200.

The previous prime is 25640269. The next prime is 25640281. The reversal of 25640275 is 57204652.

It is an interprime number because it is at equal distance from previous prime (25640269) and next prime (25640281).

It is not a de Polignac number, because 25640275 - 2⁹ = 25639763 is a prime.

It is a Duffinian 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, 512781 + ... + 512830.

Almost surely, 2^25640275 is an apocalyptic number.

25640275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

25640275 is a deficient number, since it is larger than the sum of its proper divisors (6153697).

25640275 is a wasteful number, since it uses less digits than its factorization.

25640275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025621 (or 1025616 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 25640275 is about 5063.6227150134. The cubic root of 25640275 is about 294.8769955443.

The spelling of 25640275 in words is "twenty-five million, six hundred forty thousand, two hundred seventy-five".