99638079 has 16 divisors (see below), whose sum is σ = 136391040. Its totient is φ = 64676960.

The previous prime is 99638059. The next prime is 99638083. The reversal of 99638079 is 97083699.

It is a cyclic number.

It is not a de Polignac number, because 99638079 - 2⁹ = 99637567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99638029) 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 15 ways as a sum of consecutive naturals, for example, 16309 + ... + 21569.

It is an arithmetic number, because the mean of its divisors is an integer number (8524440).

Almost surely, 2^99638079 is an apocalyptic number.

99638079 is a deficient number, since it is larger than the sum of its proper divisors (36752961).

99638079 is a wasteful number, since it uses less digits than its factorization.

99638079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5430.

The product of its (nonzero) digits is 734832, while the sum is 51.

The square root of 99638079 is about 9981.8875469522. The cubic root of 99638079 is about 463.5982436346.

The spelling of 99638079 in words is "ninety-nine million, six hundred thirty-eight thousand, seventy-nine".