99944820 has 96 divisors (see below), whose sum is σ = 316310400. Its totient is φ = 26191872.

The previous prime is 99944797. The next prime is 99944843. The reversal of 99944820 is 2844999.

It is an interprime number because it is at equal distance from previous prime (99944797) and next prime (99944843).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30292 + ... + 33428.

It is an arithmetic number, because the mean of its divisors is an integer number (3294900).

Almost surely, 2^99944820 is an apocalyptic number.

99944820 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 99944820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158155200).

99944820 is an abundant number, since it is smaller than the sum of its proper divisors (216365580).

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

99944820 is a wasteful number, since it uses less digits than its factorization.

99944820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214 (or 3206 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 99944820 is about 9997.2406192909. The cubic root of 99944820 is about 464.0734933627.

The spelling of 99944820 in words is "ninety-nine million, nine hundred forty-four thousand, eight hundred twenty".