25281648 has 90 divisors (see below), whose sum is σ = 82328064. Its totient is φ = 7221312.

The previous prime is 25281611. The next prime is 25281661. The reversal of 25281648 is 84618252.

25281648 is a `hidden beast` number, since 2 + 5 + 2 + 8 + 1 + 648 = 666.

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 17 ways as a sum of consecutive naturals, for example, 5265 + ... + 8847.

Almost surely, 2^25281648 is an apocalyptic number.

25281648 is a gapful number since it is divisible by the number (28) 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 25281648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41164032).

25281648 is an abundant number, since it is smaller than the sum of its proper divisors (57046416).

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

25281648 is a wasteful number, since it uses less digits than its factorization.

25281648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3611 (or 3595 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 25281648 is about 5028.0859181203. The cubic root of 25281648 is about 293.4957342225.

It can be divided in two parts, 252 and 81648, that multiplied together give a square (20575296 = 4536²).

The spelling of 25281648 in words is "twenty-five million, two hundred eighty-one thousand, six hundred forty-eight".