89684077729 has 3 divisors (see below), whose sum is σ = 89684377203. Its totient is φ = 89683778256.

The previous prime is 89684077727. The next prime is 89684077751. The reversal of 89684077729 is 92777048698.

The square root of 89684077729 is 299473.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 84230550625 + 5453527104 = 290225^2 + 73848^2 .

It is not a de Polignac number, because 89684077729 - 2¹ = 89684077727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89684077727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 149737 + ... + 449209.

It is an arithmetic number, because the mean of its divisors is an integer number (29894792401).

Almost surely, 2^89684077729 is an apocalyptic number.

89684077729 is the 299473-rd square number.

89684077729 is the 149737-th centered octagonal number.

It is an amenable number.

89684077729 is a deficient number, since it is larger than the sum of its proper divisors (299474).

89684077729 is an frugal number, since it uses more digits than its factorization.

89684077729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598946 (or 299473 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 67.

The spelling of 89684077729 in words is "eighty-nine billion, six hundred eighty-four million, seventy-seven thousand, seven hundred twenty-nine".