25408812 has 144 divisors (see below), whose sum is σ = 75261312. Its totient is φ = 6589440.

The previous prime is 25408793. The next prime is 25408837. The reversal of 25408812 is 21880452.

It is a self number, because there is not a number n which added to its sum of digits gives 25408812.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 379203 + ... + 379269.

It is an arithmetic number, because the mean of its divisors is an integer number (522648).

Almost surely, 2^25408812 is an apocalyptic number.

25408812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25408812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37630656).

25408812 is an abundant number, since it is smaller than the sum of its proper divisors (49852500).

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

25408812 is a wasteful number, since it uses less digits than its factorization.

25408812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 25408812 is about 5040.7154254133. The cubic root of 25408812 is about 293.9869955838.

The spelling of 25408812 in words is "twenty-five million, four hundred eight thousand, eight hundred twelve".