28381216515 has 16 divisors (see below), whose sum is σ = 45440602368. Its totient is φ = 15126430176.

The previous prime is 28381216499. The next prime is 28381216543. The reversal of 28381216515 is 51561218382.

It is not a de Polignac number, because 28381216515 - 2⁴ = 28381216499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615679 + ... + 660168.

It is an arithmetic number, because the mean of its divisors is an integer number (2840037648).

Almost surely, 2^28381216515 is an apocalyptic number.

28381216515 is a deficient number, since it is larger than the sum of its proper divisors (17059385853).

28381216515 is a wasteful number, since it uses less digits than its factorization.

28381216515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277338.

The product of its digits is 115200, while the sum is 42.

The spelling of 28381216515 in words is "twenty-eight billion, three hundred eighty-one million, two hundred sixteen thousand, five hundred fifteen".