28140812865 has 24 divisors (see below), whose sum is σ = 53211719808. Its totient is φ = 13644030240.

The previous prime is 28140812839. The next prime is 28140812873. The reversal of 28140812865 is 56821804182.

It is not a de Polignac number, because 28140812865 - 2¹³ = 28140804673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28140812865.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28424569 + ... + 28425558.

It is an arithmetic number, because the mean of its divisors is an integer number (2217154992).

Almost surely, 2^28140812865 is an apocalyptic number.

It is an amenable number.

28140812865 is a deficient number, since it is larger than the sum of its proper divisors (25070906943).

28140812865 is a wasteful number, since it uses less digits than its factorization.

28140812865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56850149 (or 56850146 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 28140812865 in words is "twenty-eight billion, one hundred forty million, eight hundred twelve thousand, eight hundred sixty-five".