25643345 has 16 divisors (see below), whose sum is σ = 37873920. Its totient is φ = 16231104.

The previous prime is 25643333. The next prime is 25643353. The reversal of 25643345 is 54334652.

It is a cyclic number.

It is not a de Polignac number, because 25643345 - 2⁴ = 25643329 is a prime.

It is a super-2 number, since 2×25643345² = 1315162285578050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27725 + ... + 28634.

It is an arithmetic number, because the mean of its divisors is an integer number (2367120).

Almost surely, 2^25643345 is an apocalyptic number.

It is an amenable number.

25643345 is a deficient number, since it is larger than the sum of its proper divisors (12230575).

25643345 is a wasteful number, since it uses less digits than its factorization.

25643345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56384.

The product of its digits is 43200, while the sum is 32.

The square root of 25643345 is about 5063.9258485882. The cubic root of 25643345 is about 294.8887639600. Note that the first 3 decimals are identical.

Adding to 25643345 its reverse (54334652), we get a palindrome (79977997).

The spelling of 25643345 in words is "twenty-five million, six hundred forty-three thousand, three hundred forty-five".