8129645 has 8 divisors (see below), whose sum is σ = 9889656. Its totient is φ = 6414336.

The previous prime is 8129633. The next prime is 8129647. The reversal of 8129645 is 5469218.

It can be written as a sum of positive squares in 4 ways, for example, as 1444 + 8128201 = 38^2 + 2851^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8129645 - 2⁴ = 8129629 is a prime.

It is a super-3 number, since 3×8129645³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8129647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10772 + ... + 11501.

It is an arithmetic number, because the mean of its divisors is an integer number (1236207).

Almost surely, 2^8129645 is an apocalyptic number.

It is an amenable number.

8129645 is a deficient number, since it is larger than the sum of its proper divisors (1760011).

8129645 is a wasteful number, since it uses less digits than its factorization.

8129645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22351.

The product of its digits is 17280, while the sum is 35.

The square root of 8129645 is about 2851.2532332292. The cubic root of 8129645 is about 201.0745909310.

The spelling of 8129645 in words is "eight million, one hundred twenty-nine thousand, six hundred forty-five".