28347446689 has 9 divisors (see below), whose sum is σ = 28648078771. Its totient is φ = 28049942200.

The previous prime is 28347446627. The next prime is 28347446707. The reversal of 28347446689 is 98664474382.

It is a happy number.

The square root of 28347446689 is 168367.

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., 27235891089 + 1111555600 = 165033^2 + 33340^2 .

It is not a de Polignac number, because 28347446689 - 2¹¹ = 28347444641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28347446389) 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, 17004234 + ... + 17005900.

Almost surely, 2^28347446689 is an apocalyptic number.

28347446689 is the 168367-th square number.

28347446689 is the 84184-th centered octagonal number.

It is an amenable number.

28347446689 is a deficient number, since it is larger than the sum of its proper divisors (300632082).

28347446689 is an frugal number, since it uses more digits than its factorization.

28347446689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3536 (or 1768 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 61.

The spelling of 28347446689 in words is "twenty-eight billion, three hundred forty-seven million, four hundred forty-six thousand, six hundred eighty-nine".