25998787 has 4 divisors (see below), whose sum is σ = 26122216. Its totient is φ = 25875360.

The previous prime is 25998781. The next prime is 25998799. The reversal of 25998787 is 78789952.

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 25998787 - 2¹⁵ = 25966019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25998781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61398 + ... + 61819.

It is an arithmetic number, because the mean of its divisors is an integer number (6530554).

Almost surely, 2^25998787 is an apocalyptic number.

25998787 is a deficient number, since it is larger than the sum of its proper divisors (123429).

25998787 is a wasteful number, since it uses less digits than its factorization.

25998787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123428.

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

The square root of 25998787 is about 5098.9005677695. The cubic root of 25998787 is about 296.2449997079.

The spelling of 25998787 in words is "twenty-five million, nine hundred ninety-eight thousand, seven hundred eighty-seven".