25398816 has 96 divisors (see below), whose sum is σ = 71850240. Its totient is φ = 7827456.

The previous prime is 25398811. The next prime is 25398859. The reversal of 25398816 is 61889352.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25398811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128830 + ... + 129026.

It is an arithmetic number, because the mean of its divisors is an integer number (748440).

Almost surely, 2^25398816 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 25398816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35925120).

25398816 is an abundant number, since it is smaller than the sum of its proper divisors (46451424).

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

25398816 is a wasteful number, since it uses less digits than its factorization.

25398816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 298 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 25398816 is about 5039.7238019558. The cubic root of 25398816 is about 293.9484383638.

The spelling of 25398816 in words is "twenty-five million, three hundred ninety-eight thousand, eight hundred sixteen".