198001680 has 40 divisors (see below), whose sum is σ = 613805952. Its totient is φ = 52800384.

The previous prime is 198001667. The next prime is 198001691. The reversal of 198001680 is 86100891.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 412264 + ... + 412743.

Almost surely, 2^198001680 is an apocalyptic number.

198001680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198001680 is an abundant number, since it is smaller than the sum of its proper divisors (415804272).

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

198001680 is a wasteful number, since it uses less digits than its factorization.

198001680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825023 (or 825017 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 198001680 is about 14071.3069755442. The cubic root of 198001680 is about 582.8493167785.

The spelling of 198001680 in words is "one hundred ninety-eight million, one thousand, six hundred eighty".