197168640 has 80 divisors (see below), whose sum is σ = 630348048. Its totient is φ = 52576256.

The previous prime is 197168623. The next prime is 197168659. The reversal of 197168640 is 46861791.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 197168592 and 197168601.

It is a congruent number.

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, 5157 + ... + 20516.

Almost surely, 2^197168640 is an apocalyptic number.

197168640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197168640 is an abundant number, since it is smaller than the sum of its proper divisors (433179408).

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

197168640 is an equidigital number, since it uses as much as digits as its factorization.

197168640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25699 (or 25683 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 197168640 is about 14041.6751137462. The cubic root of 197168640 is about 582.0307726906.

The spelling of 197168640 in words is "one hundred ninety-seven million, one hundred sixty-eight thousand, six hundred forty".