28374856513 has 4 divisors (see below), whose sum is σ = 28375659988. Its totient is φ = 28374053040.

The previous prime is 28374856493. The next prime is 28374856529. The reversal of 28374856513 is 31565847382.

It is a happy number.

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 13495004224 + 14879852289 = 116168^2 + 121983^2 .

It is a cyclic number.

It is not a de Polignac number, because 28374856513 - 2³³ = 19784921921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28374856583) 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, 346206 + ... + 420247.

It is an arithmetic number, because the mean of its divisors is an integer number (7093914997).

Almost surely, 2^28374856513 is an apocalyptic number.

It is an amenable number.

28374856513 is a deficient number, since it is larger than the sum of its proper divisors (803475).

28374856513 is an equidigital number, since it uses as much as digits as its factorization.

28374856513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803474.

The product of its digits is 4838400, while the sum is 52.

The spelling of 28374856513 in words is "twenty-eight billion, three hundred seventy-four million, eight hundred fifty-six thousand, five hundred thirteen".