99684540 has 96 divisors (see below), whose sum is σ = 311592960. Its totient is φ = 26457408.

The previous prime is 99684511. The next prime is 99684551. The reversal of 99684540 is 4548699.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197929 + ... + 198431.

It is an arithmetic number, because the mean of its divisors is an integer number (3245760).

Almost surely, 2^99684540 is an apocalyptic number.

99684540 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99684540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155796480).

99684540 is an abundant number, since it is smaller than the sum of its proper divisors (211908420).

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

99684540 is a wasteful number, since it uses less digits than its factorization.

99684540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 99684540 is about 9984.2145409642. The cubic root of 99684540 is about 463.6702906912.

The spelling of 99684540 in words is "ninety-nine million, six hundred eighty-four thousand, five hundred forty".