195778998 has 32 divisors (see below), whose sum is σ = 438211200. Its totient is φ = 64787688.

The previous prime is 195778993. The next prime is 195779033. The reversal of 195778998 is 899877591.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195778993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5536 + ... + 20547.

It is an arithmetic number, because the mean of its divisors is an integer number (13694100).

Almost surely, 2^195778998 is an apocalyptic number.

195778998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

195778998 is an abundant number, since it is smaller than the sum of its proper divisors (242432202).

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

195778998 is a wasteful number, since it uses less digits than its factorization.

195778998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26233 (or 26227 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 63.

The square root of 195778998 is about 13992.1048452333. The cubic root of 195778998 is about 580.6601658614.

The spelling of 195778998 in words is "one hundred ninety-five million, seven hundred seventy-eight thousand, nine hundred ninety-eight".