198694564 has 6 divisors (see below), whose sum is σ = 347715494. Its totient is φ = 99347280.

The previous prime is 198694553. The next prime is 198694579. The reversal of 198694564 is 465496891.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 198528100 + 166464 = 14090^2 + 408^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24836817 + ... + 24836824.

Almost surely, 2^198694564 is an apocalyptic number.

It is an amenable number.

198694564 is a deficient number, since it is larger than the sum of its proper divisors (149020930).

198694564 is a wasteful number, since it uses less digits than its factorization.

198694564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49673645 (or 49673643 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The square root of 198694564 is about 14095.9059304466. The cubic root of 198694564 is about 583.5283965516.

The spelling of 198694564 in words is "one hundred ninety-eight million, six hundred ninety-four thousand, five hundred sixty-four".