99720507 has 16 divisors (see below), whose sum is σ = 135924480. Its totient is φ = 65007072.

The previous prime is 99720497. The next prime is 99720529. The reversal of 99720507 is 70502799.

It is not a de Polignac number, because 99720507 - 2⁸ = 99720251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99720557) 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, 56208 + ... + 57954.

It is an arithmetic number, because the mean of its divisors is an integer number (8495280).

Almost surely, 2^99720507 is an apocalyptic number.

99720507 is a deficient number, since it is larger than the sum of its proper divisors (36203973).

99720507 is a wasteful number, since it uses less digits than its factorization.

99720507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162.

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 99720507 is about 9986.0155717884. The cubic root of 99720507 is about 463.7260493342.

The spelling of 99720507 in words is "ninety-nine million, seven hundred twenty thousand, five hundred seven".