197728287 has 8 divisors (see below), whose sum is σ = 264050304. Its totient is φ = 131612568.

The previous prime is 197728277. The next prime is 197728339. The reversal of 197728287 is 782827791.

It is a happy number.

197728287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 197728287 - 2⁷ = 197728159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197728277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49323 + ... + 53180.

It is an arithmetic number, because the mean of its divisors is an integer number (33006288).

Almost surely, 2^197728287 is an apocalyptic number.

197728287 is a deficient number, since it is larger than the sum of its proper divisors (66322017).

197728287 is a wasteful number, since it uses less digits than its factorization.

197728287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103149.

The product of its digits is 790272, while the sum is 51.

The square root of 197728287 is about 14061.5890638292. The cubic root of 197728287 is about 582.5809346793.

The spelling of 197728287 in words is "one hundred ninety-seven million, seven hundred twenty-eight thousand, two hundred eighty-seven".