25698 has 8 divisors (see below), whose sum is σ = 51408. Its totient is φ = 8564.

The previous prime is 25693. The next prime is 25703. The reversal of 25698 is 89652.

It is an interprime number because it is at equal distance from previous prime (25693) and next prime (25703).

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

25698 is an admirable number.

It is a super-4 number, since 4×25698⁴ = 1744445036827750464, which contains 4444 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 25698.

It is not an unprimeable number, because it can be changed into a prime (25693) by changing a digit.

25698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136 + ... + 2147.

It is an arithmetic number, because the mean of its divisors is an integer number (6426).

2²⁵⁶⁹⁸ is an apocalyptic number.

25698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25704).

25698 is a wasteful number, since it uses less digits than its factorization.

25698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288.

The product of its digits is 4320, while the sum is 30.

The square root of 25698 is about 160.3059574688. The cubic root of 25698 is about 29.5098119233.

The spelling of 25698 in words is "twenty-five thousand, six hundred ninety-eight".