99998820 has 48 divisors (see below), whose sum is σ = 311109120. Its totient is φ = 26666208.

The previous prime is 99998819. The next prime is 99998851. The reversal of 99998820 is 2889999.

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

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92052 + ... + 93131.

It is an arithmetic number, because the mean of its divisors is an integer number (6481440).

Almost surely, 2^99998820 is an apocalyptic number.

99998820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

99998820 is an abundant number, since it is smaller than the sum of its proper divisors (211110300).

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

99998820 is a wasteful number, since it uses less digits than its factorization.

99998820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185201 (or 185193 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 99998820 is about 9999.9409998259. The cubic root of 99998820 is about 464.1570576625.

The spelling of 99998820 in words is "ninety-nine million, nine hundred ninety-eight thousand, eight hundred twenty".