198764057 has 8 divisors (see below), whose sum is σ = 206425800. Its totient is φ = 191156224.

The previous prime is 198764053. The next prime is 198764089. The reversal of 198764057 is 750467891.

It can be written as a sum of positive squares in 4 ways, for example, as 152374336 + 46389721 = 12344^2 + 6811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198764057 - 2² = 198764053 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198764053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5882 + ... + 20787.

It is an arithmetic number, because the mean of its divisors is an integer number (25803225).

Almost surely, 2^198764057 is an apocalyptic number.

It is an amenable number.

198764057 is a deficient number, since it is larger than the sum of its proper divisors (7661743).

198764057 is a wasteful number, since it uses less digits than its factorization.

198764057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26955.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 198764057 is about 14098.3707214699. The cubic root of 198764057 is about 583.5964178928.

The spelling of 198764057 in words is "one hundred ninety-eight million, seven hundred sixty-four thousand, fifty-seven".