25678681 has 4 divisors (see below), whose sum is σ = 29347072. Its totient is φ = 22010292.

The previous prime is 25678663. The next prime is 25678691. The reversal of 25678681 is 18687652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25678681 - 2²³ = 17290073 is a prime.

It is a super-2 number, since 2×25678681² = 1318789315799522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25678661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834185 + ... + 1834198.

It is an arithmetic number, because the mean of its divisors is an integer number (7336768).

Almost surely, 2^25678681 is an apocalyptic number.

It is an amenable number.

25678681 is a deficient number, since it is larger than the sum of its proper divisors (3668391).

25678681 is an equidigital number, since it uses as much as digits as its factorization.

25678681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668390.

The product of its digits is 161280, while the sum is 43.

The square root of 25678681 is about 5067.4136401127. The cubic root of 25678681 is about 295.0241520013.

The spelling of 25678681 in words is "twenty-five million, six hundred seventy-eight thousand, six hundred eighty-one".