99997689 has 16 divisors (see below), whose sum is σ = 154008000. Its totient is φ = 57039360.

The previous prime is 99997687. The next prime is 99997691. The reversal of 99997689 is 98679999.

It is an interprime number because it is at equal distance from previous prime (99997687) and next prime (99997691).

It is not a de Polignac number, because 99997689 - 2¹ = 99997687 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99997687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88564 + ... + 89685.

It is an arithmetic number, because the mean of its divisors is an integer number (9625500).

Almost surely, 2^99997689 is an apocalyptic number.

It is an amenable number.

99997689 is a deficient number, since it is larger than the sum of its proper divisors (54010311).

99997689 is a wasteful number, since it uses less digits than its factorization.

99997689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178280.

The product of its digits is 19840464, while the sum is 66.

The square root of 99997689 is about 9999.8844493324. The cubic root of 99997689 is about 464.1553077631.

The spelling of 99997689 in words is "ninety-nine million, nine hundred ninety-seven thousand, six hundred eighty-nine".