25681224 has 32 divisors (see below), whose sum is σ = 64451520. Its totient is φ = 8527296.

The previous prime is 25681199. The next prime is 25681231. The reversal of 25681224 is 42218652.

It is a super-2 number, since 2×25681224² = 1319050532276352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25681191 and 25681200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4717 + ... + 8579.

It is an arithmetic number, because the mean of its divisors is an integer number (2014110).

Almost surely, 2^25681224 is an apocalyptic number.

25681224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25681224 is an abundant number, since it is smaller than the sum of its proper divisors (38770296).

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

25681224 is a wasteful number, since it uses less digits than its factorization.

25681224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149 (or 4145 counting only the distinct ones).

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

The square root of 25681224 is about 5067.6645508557. The cubic root of 25681224 is about 295.0338905812.

Adding to 25681224 its reverse (42218652), we get a palindrome (67899876).

The spelling of 25681224 in words is "twenty-five million, six hundred eighty-one thousand, two hundred twenty-four".