25781855 has 8 divisors (see below), whose sum is σ = 33750864. Its totient is φ = 18750400.

The previous prime is 25781849. The next prime is 25781857. The reversal of 25781855 is 55818752.

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

It is not a de Polignac number, because 25781855 - 2⁴ = 25781839 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 (25781857) 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, 234326 + ... + 234435.

It is an arithmetic number, because the mean of its divisors is an integer number (4218858).

Almost surely, 2^25781855 is an apocalyptic number.

25781855 is a deficient number, since it is larger than the sum of its proper divisors (7969009).

25781855 is a wasteful number, since it uses less digits than its factorization.

25781855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468777.

The product of its digits is 112000, while the sum is 41.

The square root of 25781855 is about 5077.5835788296. The cubic root of 25781855 is about 295.4187484118.

The spelling of 25781855 in words is "twenty-five million, seven hundred eighty-one thousand, eight hundred fifty-five".