198640520 has 32 divisors (see below), whose sum is σ = 481322520. Its totient is φ = 73344000.

The previous prime is 198640501. The next prime is 198640543. The reversal of 198640520 is 25046891.

It can be written as a sum of positive squares in 4 ways, for example, as 109035364 + 89605156 = 10442^2 + 9466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190481 + ... + 191520.

Almost surely, 2^198640520 is an apocalyptic number.

198640520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198640520 is an abundant number, since it is smaller than the sum of its proper divisors (282682000).

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

198640520 is a wasteful number, since it uses less digits than its factorization.

198640520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382025 (or 382021 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 198640520 is about 14093.9887895514. The cubic root of 198640520 is about 583.4754860815.

The spelling of 198640520 in words is "one hundred ninety-eight million, six hundred forty thousand, five hundred twenty".