28683148321 has 3 divisors (see below), whose sum is σ = 28683317683. Its totient is φ = 28682978960.

The previous prime is 28683148309. The next prime is 28683148327. The reversal of 28683148321 is 12384138682.

The square root of 28683148321 is 169361.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1166973921 + 27516174400 = 34161^2 + 165880^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28683148321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28683148327) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 84681 + ... + 254041.

Almost surely, 2^28683148321 is an apocalyptic number.

28683148321 is the 169361-st square number.

28683148321 is the 84681-st centered octagonal number.

It is an amenable number.

28683148321 is a deficient number, since it is larger than the sum of its proper divisors (169362).

28683148321 is an frugal number, since it uses more digits than its factorization.

28683148321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338722 (or 169361 counting only the distinct ones).

The product of its digits is 442368, while the sum is 46.

The spelling of 28683148321 in words is "twenty-eight billion, six hundred eighty-three million, one hundred forty-eight thousand, three hundred twenty-one".