198770478 has 32 divisors (see below), whose sum is σ = 405288960. Its totient is φ = 64977120.

The previous prime is 198770471. The next prime is 198770479. The reversal of 198770478 is 874077891.

It is a self number, because there is not a number n which added to its sum of digits gives 198770478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198770471) 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 in 15 ways as a sum of consecutive naturals, for example, 73083 + ... + 75753.

It is an arithmetic number, because the mean of its divisors is an integer number (12665280).

Almost surely, 2^198770478 is an apocalyptic number.

198770478 is an abundant number, since it is smaller than the sum of its proper divisors (206518482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198770478 is a wasteful number, since it uses less digits than its factorization.

198770478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912.

The product of its (nonzero) digits is 790272, while the sum is 51.

The square root of 198770478 is about 14098.5984409799. The cubic root of 198770478 is about 583.6027021146.

The spelling of 198770478 in words is "one hundred ninety-eight million, seven hundred seventy thousand, four hundred seventy-eight".