25779987 has 12 divisors (see below), whose sum is σ = 38857104. Its totient is φ = 16439280.

The previous prime is 25779977. The next prime is 25779997. The reversal of 25779987 is 78997752.

It is an interprime number because it is at equal distance from previous prime (25779977) and next prime (25779997).

It is not a de Polignac number, because 25779987 - 2¹⁴ = 25763603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25779907) 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 11 ways as a sum of consecutive naturals, for example, 62064 + ... + 62477.

It is an arithmetic number, because the mean of its divisors is an integer number (3238092).

Almost surely, 2^25779987 is an apocalyptic number.

25779987 is a deficient number, since it is larger than the sum of its proper divisors (13077117).

25779987 is a wasteful number, since it uses less digits than its factorization.

25779987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124570 (or 124567 counting only the distinct ones).

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

The square root of 25779987 is about 5077.3996297317. The cubic root of 25779987 is about 295.4116134772.

The spelling of 25779987 in words is "twenty-five million, seven hundred seventy-nine thousand, nine hundred eighty-seven".