99999679 has 16 divisors (see below), whose sum is σ = 115235680. Its totient is φ = 86002560.

The previous prime is 99999677. The next prime is 99999703. The reversal of 99999679 is 97699999.

It is a cyclic number.

It is not a de Polignac number, because 99999679 - 2¹ = 99999677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999677) 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, 11749 + ... + 18385.

It is an arithmetic number, because the mean of its divisors is an integer number (7202230).

Almost surely, 2^99999679 is an apocalyptic number.

99999679 is a deficient number, since it is larger than the sum of its proper divisors (15236001).

99999679 is a wasteful number, since it uses less digits than its factorization.

99999679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6730.

The product of its digits is 22320522, while the sum is 67.

The square root of 99999679 is about 9999.9839499871. The cubic root of 99999679 is about 464.1583867107.

The spelling of 99999679 in words is "ninety-nine million, nine hundred ninety-nine thousand, six hundred seventy-nine".