25578812 has 72 divisors (see below), whose sum is σ = 56733600. Its totient is φ = 9870336.

The previous prime is 25578811. The next prime is 25578821. The reversal of 25578812 is 21887552.

It is a happy number.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

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 23 ways as a sum of consecutive naturals, for example, 234614 + ... + 234722.

Almost surely, 2^25578812 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 25578812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28366800).

25578812 is an abundant number, since it is smaller than the sum of its proper divisors (31154788).

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

25578812 is a wasteful number, since it uses less digits than its factorization.

25578812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 164 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 25578812 is about 5057.5499997528. The cubic root of 25578812 is about 294.6411878036.

The spelling of 25578812 in words is "twenty-five million, five hundred seventy-eight thousand, eight hundred twelve".