99991684 has 48 divisors (see below), whose sum is σ = 194660928. Its totient is φ = 44650368.

The previous prime is 99991673. The next prime is 99991687. The reversal of 99991684 is 48619999.

It is not an unprimeable number, because it can be changed into a prime (99991687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 440379 + ... + 440605.

It is an arithmetic number, because the mean of its divisors is an integer number (4055436).

Almost surely, 2^99991684 is an apocalyptic number.

It is an amenable number.

99991684 is a deficient number, since it is larger than the sum of its proper divisors (94669244).

99991684 is a wasteful number, since it uses less digits than its factorization.

99991684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 482 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 55.

The square root of 99991684 is about 9999.5841913552. The cubic root of 99991684 is about 464.1460165204.

It can be divided in two parts, 999916 and 84, that added together give a 6-th power (1000000 = 10⁶).

The spelling of 99991684 in words is "ninety-nine million, nine hundred ninety-one thousand, six hundred eighty-four".