128561006 has 12 divisors (see below), whose sum is σ = 224326008. Its totient is φ = 55097532.

The previous prime is 128561003. The next prime is 128561009. The reversal of 128561006 is 600165821.

It is a happy number.

128561006 is nontrivially palindromic in base 13.

It is an interprime number because it is at equal distance from previous prime (128561003) and next prime (128561009).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128561006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128561003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 655826 + ... + 656021.

It is an arithmetic number, because the mean of its divisors is an integer number (18693834).

Almost surely, 2^128561006 is an apocalyptic number.

128561006 is a deficient number, since it is larger than the sum of its proper divisors (95765002).

128561006 is a wasteful number, since it uses less digits than its factorization.

128561006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311863 (or 1311856 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 128561006 is about 11338.4745887619. The cubic root of 128561006 is about 504.7036211454.

The spelling of 128561006 in words is "one hundred twenty-eight million, five hundred sixty-one thousand, six".