99805641 has 16 divisors (see below), whose sum is σ = 144656064. Its totient is φ = 60842304.

The previous prime is 99805637. The next prime is 99805663. The reversal of 99805641 is 14650899.

It is not a de Polignac number, because 99805641 - 2² = 99805637 is a prime.

It is a super-2 number, since 2×99805641² = 19922331950841762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99805593 and 99805602.

It is not an unprimeable number, because it can be changed into a prime (99805631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7786 + ... + 16131.

It is an arithmetic number, because the mean of its divisors is an integer number (9041004).

Almost surely, 2^99805641 is an apocalyptic number.

It is an amenable number.

99805641 is a deficient number, since it is larger than the sum of its proper divisors (44850423).

99805641 is a wasteful number, since it uses less digits than its factorization.

99805641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24040.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 99805641 is about 9990.2773234781. The cubic root of 99805641 is about 463.8579768093.

The spelling of 99805641 in words is "ninety-nine million, eight hundred five thousand, six hundred forty-one".