25779865 has 8 divisors (see below), whose sum is σ = 32564160. Its totient is φ = 19538352.

The previous prime is 25779863. The next prime is 25779893. The reversal of 25779865 is 56897752.

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 25779865 - 2¹ = 25779863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25779863) 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 7 ways as a sum of consecutive naturals, for example, 135589 + ... + 135778.

It is an arithmetic number, because the mean of its divisors is an integer number (4070520).

Almost surely, 2^25779865 is an apocalyptic number.

It is an amenable number.

25779865 is a deficient number, since it is larger than the sum of its proper divisors (6784295).

25779865 is a wasteful number, since it uses less digits than its factorization.

25779865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271391.

The product of its digits is 1058400, while the sum is 49.

The square root of 25779865 is about 5077.3876156937. The cubic root of 25779865 is about 295.4111474791.

The spelling of 25779865 in words is "twenty-five million, seven hundred seventy-nine thousand, eight hundred sixty-five".