28798804081 has 4 divisors (see below), whose sum is σ = 28837564992. Its totient is φ = 28760043172.

The previous prime is 28798804043. The next prime is 28798804103. The reversal of 28798804081 is 18040889782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28798804081 - 2²³ = 28790415473 is a prime.

It is a super-2 number, since 2×28798804081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28798804381) 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, 19379341 + ... + 19380826.

It is an arithmetic number, because the mean of its divisors is an integer number (7209391248).

Almost surely, 2^28798804081 is an apocalyptic number.

It is an amenable number.

28798804081 is a deficient number, since it is larger than the sum of its proper divisors (38760911).

28798804081 is an equidigital number, since it uses as much as digits as its factorization.

28798804081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38760910.

The product of its (nonzero) digits is 2064384, while the sum is 55.

The spelling of 28798804081 in words is "twenty-eight billion, seven hundred ninety-eight million, eight hundred four thousand, eighty-one".