99809944 has 32 divisors (see below), whose sum is σ = 202018320. Its totient is φ = 45956736.

The previous prime is 99809939. The next prime is 99809981. The reversal of 99809944 is 44990899.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 99809891 and 99809900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57067 + ... + 58789.

Almost surely, 2^99809944 is an apocalyptic number.

It is an amenable number.

99809944 is an abundant number, since it is smaller than the sum of its proper divisors (102208376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99809944 is a wasteful number, since it uses less digits than its factorization.

99809944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299 (or 2295 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 52.

The square root of 99809944 is about 9990.4926805438. The cubic root of 99809944 is about 463.8646429395.

The spelling of 99809944 in words is "ninety-nine million, eight hundred nine thousand, nine hundred forty-four".