28429669321 has 9 divisors (see below), whose sum is σ = 28725913191. Its totient is φ = 28136454792.

The previous prime is 28429669297. The next prime is 28429669327. The reversal of 28429669321 is 12396692482.

The square root of 28429669321 is 168611.

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., 861716025 + 27567953296 = 29355^2 + 166036^2 .

It is not a de Polignac number, because 28429669321 - 2¹⁵ = 28429636553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28429669327) 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, 17366115 + ... + 17367751.

Almost surely, 2^28429669321 is an apocalyptic number.

28429669321 is the 168611-st square number.

28429669321 is the 84306-th centered octagonal number.

It is an amenable number.

28429669321 is a deficient number, since it is larger than the sum of its proper divisors (296243870).

28429669321 is an frugal number, since it uses more digits than its factorization.

28429669321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480 (or 1740 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 52.

The spelling of 28429669321 in words is "twenty-eight billion, four hundred twenty-nine million, six hundred sixty-nine thousand, three hundred twenty-one".