128654885 has 4 divisors (see below), whose sum is σ = 154385868. Its totient is φ = 102923904.

The previous prime is 128654881. The next prime is 128654887. The reversal of 128654885 is 588456821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36168196 + 92486689 = 6014^2 + 9617^2 .

It is a cyclic number.

It is not a de Polignac number, because 128654885 - 2² = 128654881 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128654881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12865484 + ... + 12865493.

It is an arithmetic number, because the mean of its divisors is an integer number (38596467).

Almost surely, 2^128654885 is an apocalyptic number.

It is an amenable number.

128654885 is a deficient number, since it is larger than the sum of its proper divisors (25730983).

128654885 is an equidigital number, since it uses as much as digits as its factorization.

128654885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25730982.

The product of its digits is 614400, while the sum is 47.

The square root of 128654885 is about 11342.6136758685. The cubic root of 128654885 is about 504.8264410278.

The spelling of 128654885 in words is "one hundred twenty-eight million, six hundred fifty-four thousand, eight hundred eighty-five".