28616120569 has 9 divisors (see below), whose sum is σ = 28847176527. Its totient is φ = 28386904704.

The previous prime is 28616120537. The next prime is 28616120573. The reversal of 28616120569 is 96502161682.

The square root of 28616120569 is 169163.

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., 9603020025 + 19013100544 = 97995^2 + 137888^2 .

It is not a de Polignac number, because 28616120569 - 2⁵ = 28616120537 is a prime.

It is a super-2 number, since 2×28616120569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28616120509) 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, 23513049 + ... + 23514265.

Almost surely, 2^28616120569 is an apocalyptic number.

28616120569 is the 169163-rd square number.

28616120569 is the 84582-nd centered octagonal number.

It is an amenable number.

28616120569 is a deficient number, since it is larger than the sum of its proper divisors (231055958).

28616120569 is an frugal number, since it uses more digits than its factorization.

28616120569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2712 (or 1356 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 28616120569 in words is "twenty-eight billion, six hundred sixteen million, one hundred twenty thousand, five hundred sixty-nine".