25661236 has 24 divisors (see below), whose sum is σ = 45934560. Its totient is φ = 12540000.

The previous prime is 25661231. The next prime is 25661243. The reversal of 25661236 is 63216652.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 25661198 and 25661207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25661231) 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 in 7 ways as a sum of consecutive naturals, for example, 61035 + ... + 61453.

It is an arithmetic number, because the mean of its divisors is an integer number (1913940).

Almost surely, 2^25661236 is an apocalyptic number.

It is an amenable number.

25661236 is a deficient number, since it is larger than the sum of its proper divisors (20273324).

25661236 is a wasteful number, since it uses less digits than its factorization.

25661236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 733 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 25661236 is about 5065.6920553859. The cubic root of 25661236 is about 294.9573279271.

Adding to 25661236 its reverse (63216652), we get a palindrome (88877888).

The spelling of 25661236 in words is "twenty-five million, six hundred sixty-one thousand, two hundred thirty-six".