28009034881 has 15 divisors (see below), whose sum is σ = 29155864341. Its totient is φ = 26907310584.

The previous prime is 28009034861. The next prime is 28009034917. The reversal of 28009034881 is 18843090082.

The square root of 28009034881 is 167359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 66569281 + 27942465600 = 8159^2 + 167160^2 .

It is not a de Polignac number, because 28009034881 - 2⁵ = 28009034849 is a prime.

It is a super-2 number, since 2×28009034881² (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 (28009034821) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 140748820 + ... + 140749018.

Almost surely, 2^28009034881 is an apocalyptic number.

28009034881 is the 167359-th square number.

28009034881 is the 83680-th centered octagonal number.

It is an amenable number.

28009034881 is a deficient number, since it is larger than the sum of its proper divisors (1146829460).

28009034881 is an frugal number, since it uses more digits than its factorization.

28009034881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 228 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 28009034881 in words is "twenty-eight billion, nine million, thirty-four thousand, eight hundred eighty-one".