28102834321 has 9 divisors (see below), whose sum is σ = 28652139579. Its totient is φ = 27563874936.

The previous prime is 28102834313. The next prime is 28102834367. The reversal of 28102834321 is 12343820182.

It is a happy number.

The square root of 28102834321 is 167639.

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

It can be written as a sum of positive squares in only one way, i.e., 20259252225 + 7843582096 = 142335^2 + 88564^2 .

It is not a de Polignac number, because 28102834321 - 2³ = 28102834313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28102834381) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8883286 + ... + 8886448.

Almost surely, 2^28102834321 is an apocalyptic number.

28102834321 is the 167639-th square number.

28102834321 is the 83820-th centered octagonal number.

It is an amenable number.

28102834321 is a deficient number, since it is larger than the sum of its proper divisors (549305258).

28102834321 is an frugal number, since it uses more digits than its factorization.

28102834321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 28102834321 in words is "twenty-eight billion, one hundred two million, eight hundred thirty-four thousand, three hundred twenty-one".