8640789 has 8 divisors (see below), whose sum is σ = 11693280. Its totient is φ = 5674416.

The previous prime is 8640787. The next prime is 8640799. The reversal of 8640789 is 9870468.

It is a happy number.

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

It is not a de Polignac number, because 8640789 - 2¹ = 8640787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8640789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8640781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21294 + ... + 21695.

It is an arithmetic number, because the mean of its divisors is an integer number (1461660).

Almost surely, 2^8640789 is an apocalyptic number.

It is an amenable number.

8640789 is a deficient number, since it is larger than the sum of its proper divisors (3052491).

8640789 is a wasteful number, since it uses less digits than its factorization.

8640789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43059.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 8640789 is about 2939.5218999014. The cubic root of 8640789 is about 205.2033595732.

The spelling of 8640789 in words is "eight million, six hundred forty thousand, seven hundred eighty-nine".