28877528915 has 4 divisors (see below), whose sum is σ = 34653034704. Its totient is φ = 23102023128.

The previous prime is 28877528903. The next prime is 28877528929. The reversal of 28877528915 is 51982577882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51982577882 = 2 ⋅25991288941.

It is a cyclic number.

It is not a de Polignac number, because 28877528915 - 2⁴ = 28877528899 is a prime.

It is a super-2 number, since 2×28877528915² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2887752887 + ... + 2887752896.

It is an arithmetic number, because the mean of its divisors is an integer number (8663258676).

Almost surely, 2^28877528915 is an apocalyptic number.

28877528915 is a deficient number, since it is larger than the sum of its proper divisors (5775505789).

28877528915 is an equidigital number, since it uses as much as digits as its factorization.

28877528915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5775505788.

The product of its digits is 22579200, while the sum is 62.

The spelling of 28877528915 in words is "twenty-eight billion, eight hundred seventy-seven million, five hundred twenty-eight thousand, nine hundred fifteen".