25664231 has 4 divisors (see below), whose sum is σ = 27015000. Its totient is φ = 24313464.

The previous prime is 25664189. The next prime is 25664239. The reversal of 25664231 is 13246652.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 25664231 - 2²² = 21469927 is a prime.

It is a super-2 number, since 2×25664231² = 1317305505642722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25664194 and 25664203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25664239) 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, 675356 + ... + 675393.

It is an arithmetic number, because the mean of its divisors is an integer number (6753750).

Almost surely, 2^25664231 is an apocalyptic number.

25664231 is a deficient number, since it is larger than the sum of its proper divisors (1350769).

25664231 is a wasteful number, since it uses less digits than its factorization.

25664231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350768.

The product of its digits is 8640, while the sum is 29.

The square root of 25664231 is about 5065.9876628354. The cubic root of 25664231 is about 294.9688025996.

The spelling of 25664231 in words is "twenty-five million, six hundred sixty-four thousand, two hundred thirty-one".