25481664 has 168 divisors, whose sum is σ = 81546192. Its totient is φ = 7557120.

The previous prime is 25481647. The next prime is 25481681. The reversal of 25481664 is 46618452.

It is an interprime number because it is at equal distance from previous prime (25481647) and next prime (25481681).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306967 + ... + 307049.

It is an arithmetic number, because the mean of its divisors is an integer number (485394).

Almost surely, 2^25481664 is an apocalyptic number.

25481664 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 25481664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40773096).

25481664 is an abundant number, since it is smaller than the sum of its proper divisors (56064528).

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

25481664 is a wasteful number, since it uses less digits than its factorization.

25481664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 142 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 25481664 is about 5047.9366081598. The cubic root of 25481664 is about 294.2677000854.

It can be divided in two parts, 254 and 81664, that added together give a palindrome (81918).

The spelling of 25481664 in words is "twenty-five million, four hundred eighty-one thousand, six hundred sixty-four".