197128686 has 32 divisors (see below), whose sum is σ = 415929600. Its totient is φ = 62112960.

The previous prime is 197128663. The next prime is 197128693. The reversal of 197128686 is 686821791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57735 + ... + 61053.

It is an arithmetic number, because the mean of its divisors is an integer number (12997800).

Almost surely, 2^197128686 is an apocalyptic number.

197128686 is an abundant number, since it is smaller than the sum of its proper divisors (218800914).

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

197128686 is a wasteful number, since it uses less digits than its factorization.

197128686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3864.

The product of its digits is 290304, while the sum is 48.

The square root of 197128686 is about 14040.2523481596. The cubic root of 197128686 is about 581.9914560454.

The spelling of 197128686 in words is "one hundred ninety-seven million, one hundred twenty-eight thousand, six hundred eighty-six".