197881268 has 24 divisors (see below), whose sum is σ = 385792680. Its totient is φ = 88179840.

The previous prime is 197881247. The next prime is 197881279. The reversal of 197881268 is 862188791.

It can be written as a sum of positive squares in 4 ways, for example, as 48748324 + 149132944 = 6982^2 + 12212^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 64103 + ... + 67118.

It is an arithmetic number, because the mean of its divisors is an integer number (16074695).

Almost surely, 2^197881268 is an apocalyptic number.

It is an amenable number.

197881268 is a deficient number, since it is larger than the sum of its proper divisors (187911412).

197881268 is a wasteful number, since it uses less digits than its factorization.

197881268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131267 (or 131265 counting only the distinct ones).

The product of its digits is 387072, while the sum is 50.

The square root of 197881268 is about 14067.0276888901. The cubic root of 197881268 is about 582.7311422198.

The spelling of 197881268 in words is "one hundred ninety-seven million, eight hundred eighty-one thousand, two hundred sixty-eight".