28332729217 has 32 divisors (see below), whose sum is σ = 31743774720. Its totient is φ = 25111848960.

The previous prime is 28332729209. The next prime is 28332729253. The reversal of 28332729217 is 71292723382.

It is a cyclic number.

It is not a de Polignac number, because 28332729217 - 2³ = 28332729209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28332729277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39405384 + ... + 39406102.

It is an arithmetic number, because the mean of its divisors is an integer number (991992960).

Almost surely, 2^28332729217 is an apocalyptic number.

It is an amenable number.

28332729217 is a deficient number, since it is larger than the sum of its proper divisors (3411045503).

28332729217 is a wasteful number, since it uses less digits than its factorization.

28332729217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393.

The product of its digits is 508032, while the sum is 46.

The spelling of 28332729217 in words is "twenty-eight billion, three hundred thirty-two million, seven hundred twenty-nine thousand, two hundred seventeen".