28317148729 has 3 divisors (see below), whose sum is σ = 28317317007. Its totient is φ = 28316980452.

The previous prime is 28317148711. The next prime is 28317148753. The reversal of 28317148729 is 92784171382.

The square root of 28317148729 is 168277.

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., 1960275625 + 26356873104 = 44275^2 + 162348^2 .

It is not a de Polignac number, because 28317148729 - 2⁵ = 28317148697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28317148799) 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, 84139 + ... + 252415.

It is an arithmetic number, because the mean of its divisors is an integer number (9439105669).

Almost surely, 2^28317148729 is an apocalyptic number.

28317148729 is the 168277-th square number.

28317148729 is the 84139-th centered octagonal number.

It is an amenable number.

28317148729 is a deficient number, since it is larger than the sum of its proper divisors (168278).

28317148729 is an frugal number, since it uses more digits than its factorization.

28317148729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336554 (or 168277 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 52.

The spelling of 28317148729 in words is "twenty-eight billion, three hundred seventeen million, one hundred forty-eight thousand, seven hundred twenty-nine".