25997787 has 16 divisors (see below), whose sum is σ = 38766880. Its totient is φ = 17218656.

The previous prime is 25997771. The next prime is 25997801. The reversal of 25997787 is 78779952.

It is not a de Polignac number, because 25997787 - 2⁴ = 25997771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25997707) 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, 1173 + ... + 7305.

It is an arithmetic number, because the mean of its divisors is an integer number (2422930).

Almost surely, 2^25997787 is an apocalyptic number.

25997787 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25997787 is a deficient number, since it is larger than the sum of its proper divisors (12769093).

25997787 is a wasteful number, since it uses less digits than its factorization.

25997787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6299 (or 6293 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 54.

The square root of 25997787 is about 5098.8025064715. The cubic root of 25997787 is about 296.2412014692.

The spelling of 25997787 in words is "twenty-five million, nine hundred ninety-seven thousand, seven hundred eighty-seven".