198177798 has 128 divisors (see below), whose sum is σ = 522289152. Its totient is φ = 48698496.

The previous prime is 198177769. The next prime is 198177799. The reversal of 198177798 is 897771891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198177799) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 539811 + ... + 540177.

It is an arithmetic number, because the mean of its divisors is an integer number (4080384).

Almost surely, 2^198177798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198177798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (261144576).

198177798 is an abundant number, since it is smaller than the sum of its proper divisors (324111354).

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

198177798 is a wasteful number, since it uses less digits than its factorization.

198177798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458.

The product of its digits is 1778112, while the sum is 57.

The square root of 198177798 is about 14077.5636386415. The cubic root of 198177798 is about 583.0220759793.

The spelling of 198177798 in words is "one hundred ninety-eight million, one hundred seventy-seven thousand, seven hundred ninety-eight".