99765619 has 4 divisors (see below), whose sum is σ = 99908640. Its totient is φ = 99622600.

The previous prime is 99765593. The next prime is 99765643. The reversal of 99765619 is 91656799.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99765619 is a prime.

It is a super-2 number, since 2×99765619² = 19906357468906322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99765649) 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, 70459 + ... + 71860.

It is an arithmetic number, because the mean of its divisors is an integer number (24977160).

Almost surely, 2^99765619 is an apocalyptic number.

99765619 is a deficient number, since it is larger than the sum of its proper divisors (143021).

99765619 is a wasteful number, since it uses less digits than its factorization.

99765619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143020.

The product of its digits is 918540, while the sum is 52.

The square root of 99765619 is about 9988.2740751343. The cubic root of 99765619 is about 463.7959662664.

The spelling of 99765619 in words is "ninety-nine million, seven hundred sixty-five thousand, six hundred nineteen".