25642791 has 8 divisors (see below), whose sum is σ = 37989360. Its totient is φ = 17095176.

The previous prime is 25642781. The next prime is 25642801. The reversal of 25642791 is 19724652.

25642791 is a `hidden beast` number, since 2 + 5 + 642 + 7 + 9 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (25642781) and next prime (25642801).

It is not a de Polignac number, because 25642791 - 2⁵ = 25642759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474840 + ... + 474893.

It is an arithmetic number, because the mean of its divisors is an integer number (4748670).

Almost surely, 2^25642791 is an apocalyptic number.

25642791 is a deficient number, since it is larger than the sum of its proper divisors (12346569).

25642791 is an equidigital number, since it uses as much as digits as its factorization.

25642791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949742 (or 949736 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 25642791 is about 5063.8711476498. The cubic root of 25642791 is about 294.8866403480.

The spelling of 25642791 in words is "twenty-five million, six hundred forty-two thousand, seven hundred ninety-one".