25787791 has 4 divisors (see below), whose sum is σ = 25831872. Its totient is φ = 25743712.

The previous prime is 25787789. The next prime is 25787803. The reversal of 25787791 is 19778752.

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

It is a cyclic number.

It is not a de Polignac number, because 25787791 - 2¹ = 25787789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25787701) 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, 21151 + ... + 22336.

It is an arithmetic number, because the mean of its divisors is an integer number (6457968).

Almost surely, 2^25787791 is an apocalyptic number.

25787791 is a deficient number, since it is larger than the sum of its proper divisors (44081).

25787791 is an equidigital number, since it uses as much as digits as its factorization.

25787791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44080.

The product of its digits is 246960, while the sum is 46.

The square root of 25787791 is about 5078.1680752019. The cubic root of 25787791 is about 295.4414190216.

The spelling of 25787791 in words is "twenty-five million, seven hundred eighty-seven thousand, seven hundred ninety-one".