198778560 has 56 divisors (see below), whose sum is σ = 631124976. Its totient is φ = 53007360.

The previous prime is 198778553. The next prime is 198778571. The reversal of 198778560 is 65877891.

198778560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102571 + ... + 104490.

Almost surely, 2^198778560 is an apocalyptic number.

198778560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198778560 is an abundant number, since it is smaller than the sum of its proper divisors (432346416).

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

198778560 is a wasteful number, since it uses less digits than its factorization.

198778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207081 (or 207071 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 51.

The square root of 198778560 is about 14098.8850623019. The cubic root of 198778560 is about 583.6106117619.

The spelling of 198778560 in words is "one hundred ninety-eight million, seven hundred seventy-eight thousand, five hundred sixty".