198491580 has 96 divisors (see below), whose sum is σ = 705761280. Its totient is φ = 45368640.

The previous prime is 198491567. The next prime is 198491581. The reversal of 198491580 is 85194891.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198491581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22476 + ... + 30035.

It is an arithmetic number, because the mean of its divisors is an integer number (7351680).

Almost surely, 2^198491580 is an apocalyptic number.

198491580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198491580 is an abundant number, since it is smaller than the sum of its proper divisors (507269700).

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

198491580 is a wasteful number, since it uses less digits than its factorization.

198491580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52536 (or 52528 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 198491580 is about 14088.7039858179. The cubic root of 198491580 is about 583.3296202938.

The spelling of 198491580 in words is "one hundred ninety-eight million, four hundred ninety-one thousand, five hundred eighty".