25857630 has 56 divisors (see below), whose sum is σ = 69803352. Its totient is φ = 6893424.

The previous prime is 25857619. The next prime is 25857653. The reversal of 25857630 is 3675852.

25857630 is a `hidden beast` number, since 2 + 58 + 576 + 30 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 5517 + ... + 9063.

Almost surely, 2^25857630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25857630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34901676).

25857630 is an abundant number, since it is smaller than the sum of its proper divisors (43945722).

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

25857630 is an equidigital number, since it uses as much as digits as its factorization.

25857630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3572 (or 3557 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 25857630 is about 5085.0398228529. The cubic root of 25857630 is about 295.7078853597.

The spelling of 25857630 in words is "twenty-five million, eight hundred fifty-seven thousand, six hundred thirty".