197787128 has 48 divisors (see below), whose sum is σ = 470626200. Its totient is φ = 77058240.

The previous prime is 197787113. The next prime is 197787137. The reversal of 197787128 is 821787791.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18623 + ... + 27246.

Almost surely, 2^197787128 is an apocalyptic number.

It is an amenable number.

197787128 is an abundant number, since it is smaller than the sum of its proper divisors (272839072).

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

197787128 is a wasteful number, since it uses less digits than its factorization.

197787128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45900 (or 45889 counting only the distinct ones).

The product of its digits is 395136, while the sum is 50.

The square root of 197787128 is about 14063.6811681722. The cubic root of 197787128 is about 582.6387180909.

The spelling of 197787128 in words is "one hundred ninety-seven million, seven hundred eighty-seven thousand, one hundred twenty-eight".