28018015393 has 4 divisors (see below), whose sum is σ = 28295421588. Its totient is φ = 27740609200.

The previous prime is 28018015351. The next prime is 28018015397. The reversal of 28018015393 is 39351081082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19774828129 + 8243187264 = 140623^2 + 90792^2 .

It is a cyclic number.

It is not a de Polignac number, because 28018015393 - 2⁹ = 28018014881 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28018015397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138702946 + ... + 138703147.

It is an arithmetic number, because the mean of its divisors is an integer number (7073855397).

Almost surely, 2^28018015393 is an apocalyptic number.

It is an amenable number.

28018015393 is a deficient number, since it is larger than the sum of its proper divisors (277406195).

28018015393 is a wasteful number, since it uses less digits than its factorization.

28018015393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277406194.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 28018015393 in words is "twenty-eight billion, eighteen million, fifteen thousand, three hundred ninety-three".