25720636 has 6 divisors (see below), whose sum is σ = 45011120. Its totient is φ = 12860316.

The previous prime is 25720631. The next prime is 25720649. The reversal of 25720636 is 63602752.

It is a super-2 number, since 2×25720636² = 1323102232488992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25720598 and 25720607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215076 + ... + 3215083.

Almost surely, 2^25720636 is an apocalyptic number.

It is an amenable number.

25720636 is a deficient number, since it is larger than the sum of its proper divisors (19290484).

25720636 is a wasteful number, since it uses less digits than its factorization.

25720636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430163 (or 6430161 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 25720636 is about 5071.5516363338. The cubic root of 25720636 is about 295.1847392125.

The spelling of 25720636 in words is "twenty-five million, seven hundred twenty thousand, six hundred thirty-six".