25642897 has 4 divisors (see below), whose sum is σ = 29306176. Its totient is φ = 21979620.

The previous prime is 25642891. The next prime is 25642909. The reversal of 25642897 is 79824652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25642897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25642891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831629 + ... + 1831642.

It is an arithmetic number, because the mean of its divisors is an integer number (7326544).

Almost surely, 2^25642897 is an apocalyptic number.

It is an amenable number.

25642897 is a deficient number, since it is larger than the sum of its proper divisors (3663279).

25642897 is an equidigital number, since it uses as much as digits as its factorization.

25642897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663278.

The product of its digits is 241920, while the sum is 43.

The square root of 25642897 is about 5063.8816139400. The cubic root of 25642897 is about 294.8870466732.

The spelling of 25642897 in words is "twenty-five million, six hundred forty-two thousand, eight hundred ninety-seven".