197706728 has 8 divisors (see below), whose sum is σ = 370700130. Its totient is φ = 98853360.

The previous prime is 197706727. The next prime is 197706737. The reversal of 197706728 is 827607791.

197706728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 100841764 + 96864964 = 10042^2 + 9842^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (197706727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12356663 + ... + 12356678.

Almost surely, 2^197706728 is an apocalyptic number.

It is an amenable number.

197706728 is a deficient number, since it is larger than the sum of its proper divisors (172993402).

197706728 is a wasteful number, since it uses less digits than its factorization.

197706728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24713347 (or 24713343 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 47.

The square root of 197706728 is about 14060.8224510517. The cubic root of 197706728 is about 582.5597603040.

The spelling of 197706728 in words is "one hundred ninety-seven million, seven hundred six thousand, seven hundred twenty-eight".