99819780 has 48 divisors (see below), whose sum is σ = 280117824. Its totient is φ = 26559360.

The previous prime is 99819779. The next prime is 99819781. The reversal of 99819780 is 8791899.

It is an interprime number because it is at equal distance from previous prime (99819779) and next prime (99819781).

It is not an unprimeable number, because it can be changed into a prime (99819781) 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 15 ways as a sum of consecutive naturals, for example, 29790 + ... + 32970.

It is an arithmetic number, because the mean of its divisors is an integer number (5835788).

Almost surely, 2^99819780 is an apocalyptic number.

It is an amenable number.

99819780 is an abundant number, since it is smaller than the sum of its proper divisors (180298044).

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

99819780 is a wasteful number, since it uses less digits than its factorization.

99819780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716 (or 3714 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 99819780 is about 9990.9849364314. The cubic root of 99819780 is about 463.8798799743.

The spelling of 99819780 in words is "ninety-nine million, eight hundred nineteen thousand, seven hundred eighty".