99806643 has 12 divisors (see below), whose sum is σ = 152645688. Its totient is φ = 62623680.

The previous prime is 99806611. The next prime is 99806653. The reversal of 99806643 is 34660899.

It is not a de Polignac number, because 99806643 - 2⁵ = 99806611 is a prime.

It is a super-2 number, since 2×99806643² = 19922731973858898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99806653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 326013 + ... + 326318.

It is an arithmetic number, because the mean of its divisors is an integer number (12720474).

Almost surely, 2^99806643 is an apocalyptic number.

99806643 is a deficient number, since it is larger than the sum of its proper divisors (52839045).

99806643 is a wasteful number, since it uses less digits than its factorization.

99806643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652354 (or 652351 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 99806643 is about 9990.3274721102. The cubic root of 99806643 is about 463.8595291068.

The spelling of 99806643 in words is "ninety-nine million, eight hundred six thousand, six hundred forty-three".