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25638 = 234273
BaseRepresentation
bin110010000100110
31022011120
412100212
51310023
6314410
7134514
oct62046
938146
1025638
1118298
1212a06
13b892
1494b4
1578e3
hex6426

25638 has 8 divisors (see below), whose sum is σ = 51288. Its totient is φ = 8544.

The previous prime is 25633. The next prime is 25639. The reversal of 25638 is 83652.

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

25638 is an admirable number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25633) 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, 2131 + ... + 2142.

It is an arithmetic number, because the mean of its divisors is an integer number (6411).

225638 is an apocalyptic number.

25638 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 (25644).

25638 is a wasteful number, since it uses less digits than its factorization.

25638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

The product of its digits is 1440, while the sum is 24.

The square root of 25638 is about 160.1187059653. The cubic root of 25638 is about 29.4868274044.

The spelling of 25638 in words is "twenty-five thousand, six hundred thirty-eight".

Divisors: 1 2 3 6 4273 8546 12819 25638