99768181 has 8 divisors (see below), whose sum is σ = 104206464. Its totient is φ = 95338320.

The previous prime is 99768167. The next prime is 99768197. The reversal of 99768181 is 18186799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99768181 - 2⁹ = 99767669 is a prime.

It is a super-2 number, since 2×99768181² = 19907379880097522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99768131) 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 7 ways as a sum of consecutive naturals, for example, 42016 + ... + 44326.

It is an arithmetic number, because the mean of its divisors is an integer number (13025808).

Almost surely, 2^99768181 is an apocalyptic number.

It is an amenable number.

99768181 is a deficient number, since it is larger than the sum of its proper divisors (4438283).

99768181 is a wasteful number, since it uses less digits than its factorization.

99768181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4211.

The product of its digits is 217728, while the sum is 49.

The square root of 99768181 is about 9988.4023246964. The cubic root of 99768181 is about 463.7999363552.

The spelling of 99768181 in words is "ninety-nine million, seven hundred sixty-eight thousand, one hundred eighty-one".