128920645 has 16 divisors (see below), whose sum is σ = 180144000. Its totient is φ = 86733504.

The previous prime is 128920619. The next prime is 128920651. The reversal of 128920645 is 546029821.

It is a cyclic number.

It is not a de Polignac number, because 128920645 - 2¹¹ = 128918597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32895 + ... + 36604.

It is an arithmetic number, because the mean of its divisors is an integer number (11259000).

Almost surely, 2^128920645 is an apocalyptic number.

It is an amenable number.

128920645 is a deficient number, since it is larger than the sum of its proper divisors (51223355).

128920645 is an equidigital number, since it uses as much as digits as its factorization.

128920645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69564.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 128920645 is about 11354.3227451046. The cubic root of 128920645 is about 505.1738054820.

The spelling of 128920645 in words is "one hundred twenty-eight million, nine hundred twenty thousand, six hundred forty-five".