25821264 has 160 divisors (see below), whose sum is σ = 82026496. Its totient is φ = 6842880.

The previous prime is 25821251. The next prime is 25821269. The reversal of 25821264 is 46212852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25821269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385359 + ... + 385425.

Almost surely, 2^25821264 is an apocalyptic number.

25821264 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 25821264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41013248).

25821264 is an abundant number, since it is smaller than the sum of its proper divisors (56205232).

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

25821264 is a wasteful number, since it uses less digits than its factorization.

25821264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 147 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 25821264 is about 5081.4627815227. The cubic root of 25821264 is about 295.5691931153.

The spelling of 25821264 in words is "twenty-five million, eight hundred twenty-one thousand, two hundred sixty-four".