99773891 has 8 divisors (see below), whose sum is σ = 117959520. Its totient is φ = 82571328.

The previous prime is 99773887. The next prime is 99773893. The reversal of 99773891 is 19837799.

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

It is not a de Polignac number, because 99773891 - 2² = 99773887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99773893) 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, 245546 + ... + 245951.

It is an arithmetic number, because the mean of its divisors is an integer number (14744940).

Almost surely, 2^99773891 is an apocalyptic number.

99773891 is a deficient number, since it is larger than the sum of its proper divisors (18185629).

99773891 is a wasteful number, since it uses less digits than its factorization.

99773891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491533.

The product of its digits is 857304, while the sum is 53.

The square root of 99773891 is about 9988.6881521049. The cubic root of 99773891 is about 463.8087843569.

The spelling of 99773891 in words is "ninety-nine million, seven hundred seventy-three thousand, eight hundred ninety-one".