25781863 has 8 divisors (see below), whose sum is σ = 26672256. Its totient is φ = 24895200.

The previous prime is 25781857. The next prime is 25781881. The reversal of 25781863 is 36818752.

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 25781863 - 2²¹ = 23684711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25781813) 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, 24945 + ... + 25957.

It is an arithmetic number, because the mean of its divisors is an integer number (3334032).

Almost surely, 2^25781863 is an apocalyptic number.

25781863 is a deficient number, since it is larger than the sum of its proper divisors (890393).

25781863 is a wasteful number, since it uses less digits than its factorization.

25781863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865.

The product of its digits is 80640, while the sum is 40.

The square root of 25781863 is about 5077.5843666058. The cubic root of 25781863 is about 295.4187789675.

The spelling of 25781863 in words is "twenty-five million, seven hundred eighty-one thousand, eight hundred sixty-three".