99489618 has 18 divisors (see below), whose sum is σ = 215652567. Its totient is φ = 33149100.

The previous prime is 99489613. The next prime is 99489671. The reversal of 99489618 is 81698499.

It can be written as a sum of positive squares in only one way, i.e., 49744809 + 49744809 = 7053^2 + 7053^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=7053.

It is not an unprimeable number, because it can be changed into a prime (99489613) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 41143 + ... + 43493.

Almost surely, 2^99489618 is an apocalyptic number.

99489618 is an abundant number, since it is smaller than the sum of its proper divisors (116162949).

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

99489618 is an equidigital number, since it uses as much as digits as its factorization.

99489618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710 (or 2356 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 99489618 is about 9974.4482554174. The cubic root of 99489618 is about 463.3678749789.

The spelling of 99489618 in words is "ninety-nine million, four hundred eighty-nine thousand, six hundred eighteen".