25722 has 12 divisors (see below), whose sum is σ = 55770. Its totient is φ = 8568.

The previous prime is 25717. The next prime is 25733. The reversal of 25722 is 22752.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25281 + 441 = 159^2 + 21^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1429 = 25722 / (2 + 5 + 7 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 25695 and 25704.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 697 + ... + 732.

2²⁵⁷²² is an apocalyptic number.

25722 is an abundant number, since it is smaller than the sum of its proper divisors (30048).

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

25722 is a wasteful number, since it uses less digits than its factorization.

25722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437 (or 1434 counting only the distinct ones).

The product of its digits is 280, while the sum is 18.

The square root of 25722 is about 160.3807968555. The cubic root of 25722 is about 29.5189957135.

It can be divided in two parts, 25 and 722, that added together give a palindrome (747).

The spelling of 25722 in words is "twenty-five thousand, seven hundred twenty-two".