25704991 has 16 divisors (see below), whose sum is σ = 29352960. Its totient is φ = 22337280.

The previous prime is 25704977. The next prime is 25705027. The reversal of 25704991 is 19940752.

It is a cyclic number.

It is not a de Polignac number, because 25704991 - 2⁹ = 25704479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25704991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25704491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14626 + ... + 16288.

It is an arithmetic number, because the mean of its divisors is an integer number (1834560).

Almost surely, 2^25704991 is an apocalyptic number.

25704991 is a deficient number, since it is larger than the sum of its proper divisors (3647969).

25704991 is a wasteful number, since it uses less digits than its factorization.

25704991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 25704991 is about 5070.0089743510. The cubic root of 25704991 is about 295.1248767488.

The spelling of 25704991 in words is "twenty-five million, seven hundred four thousand, nine hundred ninety-one".