25563864 has 64 divisors (see below), whose sum is σ = 66147840. Its totient is φ = 8228480.

The previous prime is 25563841. The next prime is 25563893. The reversal of 25563864 is 46836552.

It is a super-2 number, since 2×25563864² = 1307022285220992, which contains 22 as substring.

Its product of digits (172800) is a multiple of the sum of its prime factors (360).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147682 + ... + 147854.

It is an arithmetic number, because the mean of its divisors is an integer number (1033560).

Almost surely, 2^25563864 is an apocalyptic number.

25563864 is a gapful number since it is divisible by the number (24) 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 25563864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33073920).

25563864 is an abundant number, since it is smaller than the sum of its proper divisors (40583976).

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

25563864 is a wasteful number, since it uses less digits than its factorization.

25563864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 356 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 25563864 is about 5056.0719931583. The cubic root of 25563864 is about 294.5837815058.

The spelling of 25563864 in words is "twenty-five million, five hundred sixty-three thousand, eight hundred sixty-four".