25720042 has 16 divisors (see below), whose sum is σ = 40046760. Its totient is φ = 12374208.

The previous prime is 25720039. The next prime is 25720061. The reversal of 25720042 is 24002752.

It can be written as a sum of positive squares in 4 ways, for example, as 17986081 + 7733961 = 4241^2 + 2781^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25719995 and 25720022.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22468 + ... + 23584.

Almost surely, 2^25720042 is an apocalyptic number.

25720042 is a deficient number, since it is larger than the sum of its proper divisors (14326718).

25720042 is a wasteful number, since it uses less digits than its factorization.

25720042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 25720042 is about 5071.4930740365. The cubic root of 25720042 is about 295.1824668337.

Adding to 25720042 its reverse (24002752), we get a palindrome (49722794).

The spelling of 25720042 in words is "twenty-five million, seven hundred twenty thousand, forty-two".