25994778 has 16 divisors (see below), whose sum is σ = 52238496. Its totient is φ = 8623440.

The previous prime is 25994767. The next prime is 25994783. The reversal of 25994778 is 87749952.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 25994778.

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 7 ways as a sum of consecutive naturals, for example, 9001 + ... + 11532.

It is an arithmetic number, because the mean of its divisors is an integer number (3264906).

Almost surely, 2^25994778 is an apocalyptic number.

25994778 is an abundant number, since it is smaller than the sum of its proper divisors (26243718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25994778 is a wasteful number, since it uses less digits than its factorization.

25994778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20749.

The product of its digits is 1270080, while the sum is 51.

The square root of 25994778 is about 5098.5074286501. The cubic root of 25994778 is about 296.2297719814.

The spelling of 25994778 in words is "twenty-five million, nine hundred ninety-four thousand, seven hundred seventy-eight".