28128880815 has 32 divisors (see below), whose sum is σ = 51780902400. Its totient is φ = 12772608384.

The previous prime is 28128880763. The next prime is 28128880831. The reversal of 28128880815 is 51808882182.

It is not a de Polignac number, because 28128880815 - 2¹⁵ = 28128848047 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 883329 + ... + 914618.

It is an arithmetic number, because the mean of its divisors is an integer number (1618153200).

Almost surely, 2^28128880815 is an apocalyptic number.

28128880815 is a deficient number, since it is larger than the sum of its proper divisors (23652021585).

28128880815 is a wasteful number, since it uses less digits than its factorization.

28128880815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798111.

The product of its (nonzero) digits is 655360, while the sum is 51.

The spelling of 28128880815 in words is "twenty-eight billion, one hundred twenty-eight million, eight hundred eighty thousand, eight hundred fifteen".