28978840515 has 16 divisors (see below), whose sum is σ = 46514287008. Its totient is φ = 15406000896.

The previous prime is 28978840511. The next prime is 28978840537. The reversal of 28978840515 is 51504887982.

It is not a de Polignac number, because 28978840515 - 2² = 28978840511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28978840511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3081444 + ... + 3090833.

It is an arithmetic number, because the mean of its divisors is an integer number (2907142938).

Almost surely, 2^28978840515 is an apocalyptic number.

28978840515 is a deficient number, since it is larger than the sum of its proper divisors (17535446493).

28978840515 is a wasteful number, since it uses less digits than its factorization.

28978840515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6172598.

The product of its (nonzero) digits is 6451200, while the sum is 57.

The spelling of 28978840515 in words is "twenty-eight billion, nine hundred seventy-eight million, eight hundred forty thousand, five hundred fifteen".