25915978 has 16 divisors (see below), whose sum is σ = 42651360. Its totient is φ = 11712400.

The previous prime is 25915961. The next prime is 25915987. The reversal of 25915978 is 87951952.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (2665710).

Almost surely, 2^25915978 is an apocalyptic number.

25915978 is a deficient number, since it is larger than the sum of its proper divisors (16735382).

25915978 is a wasteful number, since it uses less digits than its factorization.

25915978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6773.

The product of its digits is 226800, while the sum is 46.

The square root of 25915978 is about 5090.7738115143. The cubic root of 25915978 is about 295.9301408671.

The spelling of 25915978 in words is "twenty-five million, nine hundred fifteen thousand, nine hundred seventy-eight".