8782721015 has 4 divisors (see below), whose sum is σ = 10539265224. Its totient is φ = 7026176808.

The previous prime is 8782721009. The next prime is 8782721023. The reversal of 8782721015 is 5101272878.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8782721015 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 878272097 + ... + 878272106.

It is an arithmetic number, because the mean of its divisors is an integer number (2634816306).

Almost surely, 2^8782721015 is an apocalyptic number.

8782721015 is a deficient number, since it is larger than the sum of its proper divisors (1756544209).

8782721015 is a wasteful number, since it uses less digits than its factorization.

8782721015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756544208.

The product of its (nonzero) digits is 62720, while the sum is 41.

The square root of 8782721015 is about 93716.1726437865. The cubic root of 8782721015 is about 2063.2080763929.

The spelling of 8782721015 in words is "eight billion, seven hundred eighty-two million, seven hundred twenty-one thousand, fifteen".