25578816 has 56 divisors (see below), whose sum is σ = 68275200. Its totient is φ = 8451072.

The previous prime is 25578811. The next prime is 25578821. The reversal of 25578816 is 61887552.

It is an interprime number because it is at equal distance from previous prime (25578811) and next prime (25578821).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25578811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23860 + ... + 24908.

It is an arithmetic number, because the mean of its divisors is an integer number (1219200).

Almost surely, 2^25578816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25578816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34137600).

25578816 is an abundant number, since it is smaller than the sum of its proper divisors (42696384).

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

25578816 is a wasteful number, since it uses less digits than its factorization.

25578816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191 (or 1181 counting only the distinct ones).

The product of its digits is 134400, while the sum is 42.

The square root of 25578816 is about 5057.5503952012. The cubic root of 25578816 is about 294.6412031622.

The spelling of 25578816 in words is "twenty-five million, five hundred seventy-eight thousand, eight hundred sixteen".