197728878 has 32 divisors (see below), whose sum is σ = 405706752. Its totient is φ = 64209600.

The previous prime is 197728871. The next prime is 197728879. The reversal of 197728878 is 878827791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197728871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133683 + ... + 135153.

It is an arithmetic number, because the mean of its divisors is an integer number (12678336).

Almost surely, 2^197728878 is an apocalyptic number.

197728878 is an abundant number, since it is smaller than the sum of its proper divisors (207977874).

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

197728878 is a wasteful number, since it uses less digits than its factorization.

197728878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040.

The product of its digits is 3161088, while the sum is 57.

The square root of 197728878 is about 14061.6100785081. The cubic root of 197728878 is about 582.5815151139.

The spelling of 197728878 in words is "one hundred ninety-seven million, seven hundred twenty-eight thousand, eight hundred seventy-eight".