197681568 has 48 divisors (see below), whose sum is σ = 593046720. Its totient is φ = 56480256.

The previous prime is 197681509. The next prime is 197681569. The reversal of 197681568 is 865186791.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 197681568.

It is not an unprimeable number, because it can be changed into a prime (197681569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146413 + ... + 147756.

It is an arithmetic number, because the mean of its divisors is an integer number (12355140).

Almost surely, 2^197681568 is an apocalyptic number.

It is an amenable number.

197681568 is an abundant number, since it is smaller than the sum of its proper divisors (395365152).

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

197681568 is a wasteful number, since it uses less digits than its factorization.

197681568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294189 (or 294181 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 197681568 is about 14059.9277380789. The cubic root of 197681568 is about 582.5350472260.

The spelling of 197681568 in words is "one hundred ninety-seven million, six hundred eighty-one thousand, five hundred sixty-eight".