99720717 has 4 divisors (see below), whose sum is σ = 132960960. Its totient is φ = 66480476.

The previous prime is 99720703. The next prime is 99720727. The reversal of 99720717 is 71702799.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99720717 - 2⁶ = 99720653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99720727) 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, 16620117 + ... + 16620122.

It is an arithmetic number, because the mean of its divisors is an integer number (33240240).

Almost surely, 2^99720717 is an apocalyptic number.

It is an amenable number.

99720717 is a deficient number, since it is larger than the sum of its proper divisors (33240243).

99720717 is a wasteful number, since it uses less digits than its factorization.

99720717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240242.

The product of its (nonzero) digits is 55566, while the sum is 42.

The square root of 99720717 is about 9986.0260864871. The cubic root of 99720717 is about 463.7263748521.

The spelling of 99720717 in words is "ninety-nine million, seven hundred twenty thousand, seven hundred seventeen".