25782861 has 8 divisors (see below), whose sum is σ = 37021600. Its totient is φ = 15866352.

The previous prime is 25782853. The next prime is 25782877. The reversal of 25782861 is 16828752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25782861 - 2³ = 25782853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 661099 = 25782861 / (2 + 5 + 7 + 8 + 2 + 8 + 6 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25782161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330511 + ... + 330588.

It is an arithmetic number, because the mean of its divisors is an integer number (4627700).

Almost surely, 2^25782861 is an apocalyptic number.

It is an amenable number.

25782861 is a deficient number, since it is larger than the sum of its proper divisors (11238739).

25782861 is a wasteful number, since it uses less digits than its factorization.

25782861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661115.

The product of its digits is 53760, while the sum is 39.

The square root of 25782861 is about 5077.6826407329. The cubic root of 25782861 is about 295.4225907445.

The spelling of 25782861 in words is "twenty-five million, seven hundred eighty-two thousand, eight hundred sixty-one".