25865278 has 4 divisors (see below), whose sum is σ = 38797920. Its totient is φ = 12932638.

The previous prime is 25865263. The next prime is 25865291. The reversal of 25865278 is 87256852.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6466318 + ... + 6466321.

It is an arithmetic number, because the mean of its divisors is an integer number (9699480).

Almost surely, 2^25865278 is an apocalyptic number.

25865278 is a deficient number, since it is larger than the sum of its proper divisors (12932642).

25865278 is a wasteful number, since it uses less digits than its factorization.

25865278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12932641.

The product of its digits is 268800, while the sum is 43.

The square root of 25865278 is about 5085.7917770982. The cubic root of 25865278 is about 295.7370366647.

It can be divided in two parts, 258 and 65278, that added together give a 16-th power (65536 = 2¹⁶).

The spelling of 25865278 in words is "twenty-five million, eight hundred sixty-five thousand, two hundred seventy-eight".