198688564 has 6 divisors (see below), whose sum is σ = 347704994. Its totient is φ = 99344280.

The previous prime is 198688561. The next prime is 198688591. The reversal of 198688564 is 465886891.

It can be written as a sum of positive squares in only one way, i.e., 152720164 + 45968400 = 12358^2 + 6780^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198688561) 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, 24836067 + ... + 24836074.

Almost surely, 2^198688564 is an apocalyptic number.

It is an amenable number.

198688564 is a deficient number, since it is larger than the sum of its proper divisors (149016430).

198688564 is a wasteful number, since it uses less digits than its factorization.

198688564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49672145 (or 49672143 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 198688564 is about 14095.6931010859. The cubic root of 198688564 is about 583.5225228703.

The spelling of 198688564 in words is "one hundred ninety-eight million, six hundred eighty-eight thousand, five hundred sixty-four".