25215828 has 72 divisors (see below), whose sum is σ = 68286624. Its totient is φ = 7180800.

The previous prime is 25215823. The next prime is 25215859. The reversal of 25215828 is 82851252.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25215821) 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, 37818 + ... + 38478.

Almost surely, 2^25215828 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 25215828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34143312).

25215828 is an abundant number, since it is smaller than the sum of its proper divisors (43070796).

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

25215828 is a wasteful number, since it uses less digits than its factorization.

25215828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713 (or 694 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 25215828 is about 5021.5364182688. The cubic root of 25215828 is about 293.2408104661.

The spelling of 25215828 in words is "twenty-five million, two hundred fifteen thousand, eight hundred twenty-eight".