89947807569 has 9 divisors (see below), whose sum is σ = 129925910569. Its totient is φ = 59964605220.

The previous prime is 89947807529. The next prime is 89947807577. The reversal of 89947807569 is 96570874998.

The square root of 89947807569 is 299913.

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

89947807569 is a `hidden beast` number, since 8 + 99 + 478 + 0 + 7 + 5 + 69 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 89947807569 - 2³³ = 81357872977 is a prime.

It is a super-2 number, since 2×89947807569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 89947807497 and 89947807506.

It is not an unprimeable number, because it can be changed into a prime (89947807529) 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, 849754 + ... + 949724.

Almost surely, 2^89947807569 is an apocalyptic number.

89947807569 is the 299913-rd square number.

89947807569 is the 149957-th centered octagonal number.

It is an amenable number.

89947807569 is a deficient number, since it is larger than the sum of its proper divisors (39978103000).

89947807569 is an frugal number, since it uses more digits than its factorization.

89947807569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199948 (or 99974 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 72.

The spelling of 89947807569 in words is "eighty-nine billion, nine hundred forty-seven million, eight hundred seven thousand, five hundred sixty-nine".