25565278 has 4 divisors (see below), whose sum is σ = 38347920. Its totient is φ = 12782638.

The previous prime is 25565273. The next prime is 25565291. The reversal of 25565278 is 87256552.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 25565278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25565273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6391318 + ... + 6391321.

It is an arithmetic number, because the mean of its divisors is an integer number (9586980).

Almost surely, 2^25565278 is an apocalyptic number.

25565278 is a deficient number, since it is larger than the sum of its proper divisors (12782642).

25565278 is a wasteful number, since it uses less digits than its factorization.

25565278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12782641.

The product of its digits is 168000, while the sum is 40.

The square root of 25565278 is about 5056.2118230944. The cubic root of 25565278 is about 294.5892127894.

The spelling of 25565278 in words is "twenty-five million, five hundred sixty-five thousand, two hundred seventy-eight".