128641667 has 16 divisors (see below), whose sum is σ = 160645632. Its totient is φ = 100077120.

The previous prime is 128641663. The next prime is 128641687. The reversal of 128641667 is 766146821.

It is not a de Polignac number, because 128641667 - 2² = 128641663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128641663) 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, 71258 + ... + 73040.

It is an arithmetic number, because the mean of its divisors is an integer number (10040352).

Almost surely, 2^128641667 is an apocalyptic number.

128641667 is a deficient number, since it is larger than the sum of its proper divisors (32003965).

128641667 is a wasteful number, since it uses less digits than its factorization.

128641667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738.

The product of its digits is 96768, while the sum is 41.

The square root of 128641667 is about 11342.0309909645. The cubic root of 128641667 is about 504.8091518166.

The spelling of 128641667 in words is "one hundred twenty-eight million, six hundred forty-one thousand, six hundred sixty-seven".