99819620 has 12 divisors (see below), whose sum is σ = 209621244. Its totient is φ = 39927840.

The previous prime is 99819619. The next prime is 99819623. The reversal of 99819620 is 2691899.

It can be written as a sum of positive squares in 2 ways, for example, as 79316836 + 20502784 = 8906^2 + 4528^2 .

It is not an unprimeable number, because it can be changed into a prime (99819623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495471 + ... + 2495510.

It is an arithmetic number, because the mean of its divisors is an integer number (17468437).

Almost surely, 2^99819620 is an apocalyptic number.

It is an amenable number.

99819620 is an abundant number, since it is smaller than the sum of its proper divisors (109801624).

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

99819620 is a wasteful number, since it uses less digits than its factorization.

99819620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4990990 (or 4990988 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 99819620 is about 9990.9769292097. The cubic root of 99819620 is about 463.8796321249.

The spelling of 99819620 in words is "ninety-nine million, eight hundred nineteen thousand, six hundred twenty".