25249987 has 16 divisors (see below), whose sum is σ = 29779200. Its totient is φ = 20960352.

The previous prime is 25249979. The next prime is 25249999. The reversal of 25249987 is 78994252.

It is not a de Polignac number, because 25249987 - 2³ = 25249979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25249907) 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, 44568 + ... + 45130.

It is an arithmetic number, because the mean of its divisors is an integer number (1861200).

Almost surely, 2^25249987 is an apocalyptic number.

25249987 is a deficient number, since it is larger than the sum of its proper divisors (4529213).

25249987 is a wasteful number, since it uses less digits than its factorization.

25249987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762.

The product of its digits is 362880, while the sum is 46.

The square root of 25249987 is about 5024.9365170119. The cubic root of 25249987 is about 293.3731650742.

The spelling of 25249987 in words is "twenty-five million, two hundred forty-nine thousand, nine hundred eighty-seven".