25897987 has 8 divisors (see below), whose sum is σ = 28005696. Its totient is φ = 23855232.

The previous prime is 25897981. The next prime is 25898009. The reversal of 25897987 is 78979852.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25897987 - 2¹¹ = 25895939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25897981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15408 + ... + 17005.

It is an arithmetic number, because the mean of its divisors is an integer number (3500712).

Almost surely, 2^25897987 is an apocalyptic number.

25897987 is a deficient number, since it is larger than the sum of its proper divisors (2107709).

25897987 is a wasteful number, since it uses less digits than its factorization.

25897987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32477.

The product of its digits is 2540160, while the sum is 55.

The square root of 25897987 is about 5089.0064845704. The cubic root of 25897987 is about 295.8616462928.

The spelling of 25897987 in words is "twenty-five million, eight hundred ninety-seven thousand, nine hundred eighty-seven".