198917564 has 6 divisors (see below), whose sum is σ = 348105744. Its totient is φ = 99458780.

The previous prime is 198917531. The next prime is 198917567. The reversal of 198917564 is 465719891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198917567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24864692 + ... + 24864699.

It is an arithmetic number, because the mean of its divisors is an integer number (58017624).

Almost surely, 2^198917564 is an apocalyptic number.

It is an amenable number.

198917564 is a deficient number, since it is larger than the sum of its proper divisors (149188180).

198917564 is a wasteful number, since it uses less digits than its factorization.

198917564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49729395 (or 49729393 counting only the distinct ones).

The product of its digits is 544320, while the sum is 50.

The square root of 198917564 is about 14103.8138104557. The cubic root of 198917564 is about 583.7466178902.

The spelling of 198917564 in words is "one hundred ninety-eight million, nine hundred seventeen thousand, five hundred sixty-four".