128640197 has 8 divisors (see below), whose sum is σ = 147539136. Its totient is φ = 109871712.

The previous prime is 128640163. The next prime is 128640199. The reversal of 128640197 is 791046821.

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

It is a cyclic number.

It is not a de Polignac number, because 128640197 - 2⁸ = 128639941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128640197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128640199) 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, 30488 + ... + 34449.

It is an arithmetic number, because the mean of its divisors is an integer number (18442392).

Almost surely, 2^128640197 is an apocalyptic number.

It is an amenable number.

128640197 is a deficient number, since it is larger than the sum of its proper divisors (18898939).

128640197 is an equidigital number, since it uses as much as digits as its factorization.

128640197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65227.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 128640197 is about 11341.9661875708. The cubic root of 128640197 is about 504.8072289759.

The spelling of 128640197 in words is "one hundred twenty-eight million, six hundred forty thousand, one hundred ninety-seven".