25581264 has 40 divisors (see below), whose sum is σ = 66891552. Its totient is φ = 8423040.

The previous prime is 25581247. The next prime is 25581299. The reversal of 25581264 is 46218552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774 + ... + 7194.

Almost surely, 2^25581264 is an apocalyptic number.

25581264 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 25581264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33445776).

25581264 is an abundant number, since it is smaller than the sum of its proper divisors (41310288).

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

25581264 is a wasteful number, since it uses less digits than its factorization.

25581264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6515 (or 6509 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 25581264 is about 5057.7924038062. The cubic root of 25581264 is about 294.6506023287.

The spelling of 25581264 in words is "twenty-five million, five hundred eighty-one thousand, two hundred sixty-four".