25864978 has 8 divisors (see below), whose sum is σ = 38819772. Its totient is φ = 12925056.

The previous prime is 25864957. The next prime is 25864987. The reversal of 25864978 is 87946852.

It can be written as a sum of positive squares in 2 ways, for example, as 21836929 + 4028049 = 4673^2 + 2007^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 3226 + ... + 7882.

Almost surely, 2^25864978 is an apocalyptic number.

25864978 is a deficient number, since it is larger than the sum of its proper divisors (12954794).

25864978 is a wasteful number, since it uses less digits than its factorization.

25864978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7436.

The product of its digits is 967680, while the sum is 49.

The square root of 25864978 is about 5085.7622830801. The cubic root of 25864978 is about 295.7358932856.

The spelling of 25864978 in words is "twenty-five million, eight hundred sixty-four thousand, nine hundred seventy-eight".