990199800 has 72 divisors (see below), whose sum is σ = 3325427040. Its totient is φ = 264052800.

The previous prime is 990199783. The next prime is 990199843. The reversal of 990199800 is 8991099.

It is a tau number, because it is divible by the number of its divisors (72).

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 17 ways as a sum of consecutive naturals, for example, 273256 + ... + 276855.

Almost surely, 2^990199800 is an apocalyptic number.

990199800 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

990199800 is an abundant number, since it is smaller than the sum of its proper divisors (2335227240).

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

990199800 is a wasteful number, since it uses less digits than its factorization.

990199800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550133 (or 550121 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 990199800 is about 31467.4403153482. The cubic root of 990199800 is about 996.7225366358.

The spelling of 990199800 in words is "nine hundred ninety million, one hundred ninety-nine thousand, eight hundred".