198181628 has 24 divisors (see below), whose sum is σ = 371967120. Its totient is φ = 92102400.

The previous prime is 198181603. The next prime is 198181663. The reversal of 198181628 is 826181891.

It is a congruent number.

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, 20573 + ... + 28628.

It is an arithmetic number, because the mean of its divisors is an integer number (15498630).

Almost surely, 2^198181628 is an apocalyptic number.

It is an amenable number.

198181628 is a deficient number, since it is larger than the sum of its proper divisors (173785492).

198181628 is a wasteful number, since it uses less digits than its factorization.

198181628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49277 (or 49275 counting only the distinct ones).

The product of its digits is 55296, while the sum is 44.

The square root of 198181628 is about 14077.6996700455. The cubic root of 198181628 is about 583.0258317989.

The spelling of 198181628 in words is "one hundred ninety-eight million, one hundred eighty-one thousand, six hundred twenty-eight".