89968202809 has 9 divisors (see below), whose sum is σ = 93186541903. Its totient is φ = 86857452472.

The previous prime is 89968202777. The next prime is 89968202837. The reversal of 89968202809 is 90820286998.

The square root of 89968202809 is 299947.

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., 47177143209 + 42791059600 = 217203^2 + 206860^2 .

It is not a de Polignac number, because 89968202809 - 2⁵ = 89968202777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89968205809) 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, 8693292 + ... + 8703634.

Almost surely, 2^89968202809 is an apocalyptic number.

89968202809 is the 299947-th square number.

89968202809 is the 149974-th centered octagonal number.

It is an amenable number.

89968202809 is a deficient number, since it is larger than the sum of its proper divisors (3218339094).

89968202809 is an frugal number, since it uses more digits than its factorization.

89968202809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20744 (or 10372 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 89968202809 in words is "eighty-nine billion, nine hundred sixty-eight million, two hundred two thousand, eight hundred nine".