25604778 has 8 divisors (see below), whose sum is σ = 51209568. Its totient is φ = 8534924.

The previous prime is 25604759. The next prime is 25604797. The reversal of 25604778 is 87740652.

It is an interprime number because it is at equal distance from previous prime (25604759) and next prime (25604797).

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

25604778 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133726 + ... + 2133737.

It is an arithmetic number, because the mean of its divisors is an integer number (6401196).

Almost surely, 2^25604778 is an apocalyptic number.

25604778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25604778 is a wasteful number, since it uses less digits than its factorization.

25604778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4267468.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 25604778 is about 5060.1164018232. The cubic root of 25604778 is about 294.7408544824.

The spelling of 25604778 in words is "twenty-five million, six hundred four thousand, seven hundred seventy-eight".