99691944 has 128 divisors (see below), whose sum is σ = 292118400. Its totient is φ = 28016640.

The previous prime is 99691903. The next prime is 99691967. The reversal of 99691944 is 44919699.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 435222 + ... + 435450.

It is an arithmetic number, because the mean of its divisors is an integer number (2282175).

Almost surely, 2^99691944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99691944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146059200).

99691944 is an abundant number, since it is smaller than the sum of its proper divisors (192426456).

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

99691944 is a wasteful number, since it uses less digits than its factorization.

99691944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 359 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 99691944 is about 9984.5853193811. The cubic root of 99691944 is about 463.6817700034.

The spelling of 99691944 in words is "ninety-nine million, six hundred ninety-one thousand, nine hundred forty-four".