25690891 has 4 divisors (see below), whose sum is σ = 25704000. Its totient is φ = 25677784.

The previous prime is 25690877. The next prime is 25690933. The reversal of 25690891 is 19809652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25690891 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25690801) 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, 2956 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (6426000).

Almost surely, 2^25690891 is an apocalyptic number.

25690891 is a deficient number, since it is larger than the sum of its proper divisors (13109).

25690891 is a wasteful number, since it uses less digits than its factorization.

25690891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13108.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 25690891 is about 5068.6182535283. The cubic root of 25690891 is about 295.0709051050.

The spelling of 25690891 in words is "twenty-five million, six hundred ninety thousand, eight hundred ninety-one".