99660289 has 9 divisors (see below), whose sum is σ = 101853507. Its totient is φ = 97513944.

The previous prime is 99660271. The next prime is 99660293. The reversal of 99660289 is 98206699.

It is a happy number.

The square root of 99660289 is 9983.

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., 11675889 + 87984400 = 3417^2 + 9380^2 .

It is not a de Polignac number, because 99660289 - 2¹³ = 99652097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99660389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 668787 + ... + 668935.

Almost surely, 2^99660289 is an apocalyptic number.

99660289 is the 9983-rd square number.

99660289 is the 4992-nd centered octagonal number.

It is an amenable number.

99660289 is a deficient number, since it is larger than the sum of its proper divisors (2193218).

99660289 is an frugal number, since it uses more digits than its factorization.

99660289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The cubic root of 99660289 is about 463.6326874675.

Multiplying 99660289 by its sum of digits (49), we get a square (4883354161 = 69881²).

Multiplying 99660289 by its product of nonzero digits (419904), we get a square (41847753992256 = 6468984²).

The spelling of 99660289 in words is "ninety-nine million, six hundred sixty thousand, two hundred eighty-nine".