99685578 has 16 divisors (see below), whose sum is σ = 199517760. Its totient is φ = 33204096.

The previous prime is 99685577. The next prime is 99685583. The reversal of 99685578 is 87558699.

It is a super-2 number, since 2×99685578² = 19874428922388168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99685577) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4026 + ... + 14682.

It is an arithmetic number, because the mean of its divisors is an integer number (12469860).

Almost surely, 2^99685578 is an apocalyptic number.

99685578 is an abundant number, since it is smaller than the sum of its proper divisors (99832182).

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

99685578 is a wasteful number, since it uses less digits than its factorization.

99685578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12221.

The product of its digits is 5443200, while the sum is 57.

The square root of 99685578 is about 9984.2665228849. The cubic root of 99685578 is about 463.6719000618.

The spelling of 99685578 in words is "ninety-nine million, six hundred eighty-five thousand, five hundred seventy-eight".