99685879 has 4 divisors (see below), whose sum is σ = 99710280. Its totient is φ = 99661480.

The previous prime is 99685877. The next prime is 99685897. The reversal of 99685879 is 97858699.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99685879 - 2¹ = 99685877 is a prime.

It is a super-4 number, since 4×99685879⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99685871) 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 3 ways as a sum of consecutive naturals, for example, 4417 + ... + 14794.

It is an arithmetic number, because the mean of its divisors is an integer number (24927570).

Almost surely, 2^99685879 is an apocalyptic number.

99685879 is a deficient number, since it is larger than the sum of its proper divisors (24401).

99685879 is a wasteful number, since it uses less digits than its factorization.

99685879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24400.

The product of its digits is 9797760, while the sum is 61.

The square root of 99685879 is about 9984.2815965897. The cubic root of 99685879 is about 463.6723667462.

The spelling of 99685879 in words is "ninety-nine million, six hundred eighty-five thousand, eight hundred seventy-nine".