99878180 has 12 divisors (see below), whose sum is σ = 209744220. Its totient is φ = 39951264.

The previous prime is 99878161. The next prime is 99878183. The reversal of 99878180 is 8187899.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41783296 + 58094884 = 6464^2 + 7622^2 .

It is a super-2 number, since 2×99878180² = 19951301680224800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (99878183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2496935 + ... + 2496974.

It is an arithmetic number, because the mean of its divisors is an integer number (17478685).

Almost surely, 2^99878180 is an apocalyptic number.

It is an amenable number.

99878180 is an abundant number, since it is smaller than the sum of its proper divisors (109866040).

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

99878180 is a wasteful number, since it uses less digits than its factorization.

99878180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993918 (or 4993916 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 99878180 is about 9993.9071438552. The cubic root of 99878180 is about 463.9703273236.

The spelling of 99878180 in words is "ninety-nine million, eight hundred seventy-eight thousand, one hundred eighty".