8640829 has 4 divisors (see below), whose sum is σ = 8646880. Its totient is φ = 8634780.

The previous prime is 8640823. The next prime is 8640859. The reversal of 8640829 is 9280468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8640829 - 2⁷ = 8640701 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640823) 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 3 ways as a sum of consecutive naturals, for example, 442 + ... + 4180.

It is an arithmetic number, because the mean of its divisors is an integer number (2161720).

Almost surely, 2^8640829 is an apocalyptic number.

It is an amenable number.

8640829 is a deficient number, since it is larger than the sum of its proper divisors (6051).

8640829 is a wasteful number, since it uses less digits than its factorization.

8640829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6050.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 8640829 is about 2939.5287037211. The cubic root of 8640829 is about 205.2036762157.

The spelling of 8640829 in words is "eight million, six hundred forty thousand, eight hundred twenty-nine".