28032802813 has 4 divisors (see below), whose sum is σ = 28280880828. Its totient is φ = 27784724800.

The previous prime is 28032802769. The next prime is 28032802829. The reversal of 28032802813 is 31820823082.

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 12141174969 + 15891627844 = 110187^2 + 126062^2 .

It is a cyclic number.

It is not a de Polignac number, because 28032802813 - 2²⁹ = 27495931901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28032802843) 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, 124038838 + ... + 124039063.

It is an arithmetic number, because the mean of its divisors is an integer number (7070220207).

Almost surely, 2^28032802813 is an apocalyptic number.

It is an amenable number.

28032802813 is a deficient number, since it is larger than the sum of its proper divisors (248078015).

28032802813 is a wasteful number, since it uses less digits than its factorization.

28032802813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248078014.

The product of its (nonzero) digits is 36864, while the sum is 37.

The spelling of 28032802813 in words is "twenty-eight billion, thirty-two million, eight hundred two thousand, eight hundred thirteen".