99664 has 10 divisors (see below), whose sum is σ = 193130. Its totient is φ = 49824.

The previous prime is 99661. The next prime is 99667. The reversal of 99664 is 46699.

99664 is nontrivially palindromic in base 7.

It is an interprime number because it is at equal distance from previous prime (99661) and next prime (99667).

It can be written as a sum of positive squares in only one way, i.e., 85264 + 14400 = 292^2 + 120^2 .

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3099 + ... + 3130.

It is an arithmetic number, because the mean of its divisors is an integer number (19313).

2⁹⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

99664 is a deficient number, since it is larger than the sum of its proper divisors (93466).

99664 is a wasteful number, since it uses less digits than its factorization.

99664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6237 (or 6231 counting only the distinct ones).

The product of its digits is 11664, while the sum is 34.

The square root of 99664 is about 315.6960563580. The cubic root of 99664 is about 46.3638442082.

The spelling of 99664 in words is "ninety-nine thousand, six hundred sixty-four".