28515707315 has 4 divisors (see below), whose sum is σ = 34218848784. Its totient is φ = 22812565848.

The previous prime is 28515707309. The next prime is 28515707329. The reversal of 28515707315 is 51370751582.

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 28515707315 - 2¹⁸ = 28515445171 is a prime.

It is a super-4 number, since 4×28515707315⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2851570727 + ... + 2851570736.

It is an arithmetic number, because the mean of its divisors is an integer number (8554712196).

Almost surely, 2^28515707315 is an apocalyptic number.

28515707315 is a deficient number, since it is larger than the sum of its proper divisors (5703141469).

28515707315 is an equidigital number, since it uses as much as digits as its factorization.

28515707315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5703141468.

The product of its (nonzero) digits is 294000, while the sum is 44.

The spelling of 28515707315 in words is "twenty-eight billion, five hundred fifteen million, seven hundred seven thousand, three hundred fifteen".