99668880 has 140 divisors (see below), whose sum is σ = 347639580. Its totient is φ = 26562816.

The previous prime is 99668873. The next prime is 99668887. The reversal of 99668880 is 8886699.

It is an interprime number because it is at equal distance from previous prime (99668873) and next prime (99668887).

It can be written as a sum of positive squares in 2 ways, for example, as 26873856 + 72795024 = 5184^2 + 8532^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (99668887) 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 27 ways as a sum of consecutive naturals, for example, 57466 + ... + 59174.

Almost surely, 2^99668880 is an apocalyptic number.

99668880 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 99668880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173819790).

99668880 is an abundant number, since it is smaller than the sum of its proper divisors (247970700).

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

99668880 is a wasteful number, since it uses less digits than its factorization.

99668880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 99668880 is about 9983.4302722060. The cubic root of 99668880 is about 463.6460092363.

The spelling of 99668880 in words is "ninety-nine million, six hundred sixty-eight thousand, eight hundred eighty".