99890643 has 8 divisors (see below), whose sum is σ = 134082000. Its totient is φ = 66146528.

The previous prime is 99890627. The next prime is 99890647. The reversal of 99890643 is 34609899.

It is a happy number.

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 99890643 - 2⁴ = 99890627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99890592 and 99890601.

It is not an unprimeable number, because it can be changed into a prime (99890647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111288 + ... + 112181.

It is an arithmetic number, because the mean of its divisors is an integer number (16760250).

Almost surely, 2^99890643 is an apocalyptic number.

99890643 is a deficient number, since it is larger than the sum of its proper divisors (34191357).

99890643 is a wasteful number, since it uses less digits than its factorization.

99890643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223621.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 99890643 is about 9994.5306543129. The cubic root of 99890643 is about 463.9896249043.

The spelling of 99890643 in words is "ninety-nine million, eight hundred ninety thousand, six hundred forty-three".