8640282779 has 4 divisors (see below), whose sum is σ = 8640542400. Its totient is φ = 8640023160.

The previous prime is 8640282757. The next prime is 8640282799. The reversal of 8640282779 is 9772820468.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8640282779 - 2¹² = 8640278683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8640282779.

It is not an unprimeable number, because it can be changed into a prime (8640282799) 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, 71012 + ... + 149409.

It is an arithmetic number, because the mean of its divisors is an integer number (2160135600).

Almost surely, 2^8640282779 is an apocalyptic number.

8640282779 is a deficient number, since it is larger than the sum of its proper divisors (259621).

8640282779 is a wasteful number, since it uses less digits than its factorization.

8640282779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259620.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The square root of 8640282779 is about 92953.1214053622. The cubic root of 8640282779 is about 2051.9935221237.

The spelling of 8640282779 in words is "eight billion, six hundred forty million, two hundred eighty-two thousand, seven hundred seventy-nine".