128640601 has 16 divisors (see below), whose sum is σ = 134830080. Its totient is φ = 122627520.

The previous prime is 128640599. The next prime is 128640637. The reversal of 128640601 is 106046821.

It is a cyclic number.

It is not a de Polignac number, because 128640601 - 2¹ = 128640599 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 128640601.

It is not an unprimeable number, because it can be changed into a prime (128640691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 673416 + ... + 673606.

It is an arithmetic number, because the mean of its divisors is an integer number (8426880).

Almost surely, 2^128640601 is an apocalyptic number.

It is an amenable number.

128640601 is a deficient number, since it is larger than the sum of its proper divisors (6189479).

128640601 is a wasteful number, since it uses less digits than its factorization.

128640601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 128640601 is about 11341.9839975200. The cubic root of 128640601 is about 504.8077574315.

The spelling of 128640601 in words is "one hundred twenty-eight million, six hundred forty thousand, six hundred one".