28364959561 has 9 divisors (see below), whose sum is σ = 30134676999. Its totient is φ = 26693737824.

The previous prime is 28364959547. The next prime is 28364959627. The reversal of 28364959561 is 16595946382.

The square root of 28364959561 is 168419.

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., 22083446025 + 6281513536 = 148605^2 + 79256^2 .

It is not a de Polignac number, because 28364959561 - 2¹³ = 28364951369 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28364959496 and 28364959505.

It is not an unprimeable number, because it can be changed into a prime (28364959541) 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, 2858170 + ... + 2868076.

Almost surely, 2^28364959561 is an apocalyptic number.

28364959561 is the 168419-th square number.

28364959561 is the 84210-th centered octagonal number.

It is an amenable number.

28364959561 is a deficient number, since it is larger than the sum of its proper divisors (1769717438).

28364959561 is an frugal number, since it uses more digits than its factorization.

28364959561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19848 (or 9924 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 58.

The spelling of 28364959561 in words is "twenty-eight billion, three hundred sixty-four million, nine hundred fifty-nine thousand, five hundred sixty-one".