28217616361 has 9 divisors (see below), whose sum is σ = 31018088829. Its totient is φ = 25650698700.

The previous prime is 28217616289. The next prime is 28217616431. The reversal of 28217616361 is 16361671282.

The square root of 28217616361 is 167981.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 28217616361 - 2¹⁹ = 28217092073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28217616761) 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, 1840156 + ... + 1855426.

Almost surely, 2^28217616361 is an apocalyptic number.

28217616361 is the 167981-st square number.

28217616361 is the 83991-st centered octagonal number.

It is an amenable number.

28217616361 is a deficient number, since it is larger than the sum of its proper divisors (2800472468).

28217616361 is an frugal number, since it uses more digits than its factorization.

28217616361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30564 (or 15282 counting only the distinct ones).

The product of its digits is 145152, while the sum is 43.

The spelling of 28217616361 in words is "twenty-eight billion, two hundred seventeen million, six hundred sixteen thousand, three hundred sixty-one".