25287681 has 8 divisors (see below), whose sum is σ = 34879680. Its totient is φ = 16277072.

The previous prime is 25287679. The next prime is 25287683. The reversal of 25287681 is 18678252.

It is an interprime number because it is at equal distance from previous prime (25287679) and next prime (25287683).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25287681 - 2¹ = 25287679 is a prime.

It is a super-2 number, since 2×25287681² = 1278933620715522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25287683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145245 + ... + 145418.

It is an arithmetic number, because the mean of its divisors is an integer number (4359960).

Almost surely, 2^25287681 is an apocalyptic number.

It is an amenable number.

25287681 is a deficient number, since it is larger than the sum of its proper divisors (9591999).

25287681 is a wasteful number, since it uses less digits than its factorization.

25287681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290695.

The product of its digits is 53760, while the sum is 39.

The square root of 25287681 is about 5028.6858124166. The cubic root of 25287681 is about 293.5190781508.

The spelling of 25287681 in words is "twenty-five million, two hundred eighty-seven thousand, six hundred eighty-one".