99664779 has 4 divisors (see below), whose sum is σ = 132886376. Its totient is φ = 66443184.

The previous prime is 99664777. The next prime is 99664801. The reversal of 99664779 is 97746699.

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

It is not a de Polignac number, because 99664779 - 2¹ = 99664777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99664777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16610794 + ... + 16610799.

It is an arithmetic number, because the mean of its divisors is an integer number (33221594).

Almost surely, 2^99664779 is an apocalyptic number.

99664779 is a deficient number, since it is larger than the sum of its proper divisors (33221597).

99664779 is a wasteful number, since it uses less digits than its factorization.

99664779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33221596.

The product of its digits is 5143824, while the sum is 57.

The square root of 99664779 is about 9983.2248797671. The cubic root of 99664779 is about 463.6396500519.

The spelling of 99664779 in words is "ninety-nine million, six hundred sixty-four thousand, seven hundred seventy-nine".