99831640 has 32 divisors (see below), whose sum is σ = 224995680. Its totient is φ = 39866112.

The previous prime is 99831581. The next prime is 99831703. The reversal of 99831640 is 4613899.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 99831593 and 99831602.

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, 27364 + ... + 30796.

It is an arithmetic number, because the mean of its divisors is an integer number (7031115).

Almost surely, 2^99831640 is an apocalyptic number.

It is an amenable number.

99831640 is an abundant number, since it is smaller than the sum of its proper divisors (125164040).

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

99831640 is a wasteful number, since it uses less digits than its factorization.

99831640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4171 (or 4167 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 99831640 is about 9991.5784538780. The cubic root of 99831640 is about 463.8982510743.

The spelling of 99831640 in words is "ninety-nine million, eight hundred thirty-one thousand, six hundred forty".