128693845 has 24 divisors (see below), whose sum is σ = 180986400. Its totient is φ = 87589152.

The previous prime is 128693843. The next prime is 128693857. The reversal of 128693845 is 548396821.

It is not a de Polignac number, because 128693845 - 2¹ = 128693843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128693795 and 128693804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128693843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32166 + ... + 35944.

It is an arithmetic number, because the mean of its divisors is an integer number (7541100).

Almost surely, 2^128693845 is an apocalyptic number.

It is an amenable number.

128693845 is a deficient number, since it is larger than the sum of its proper divisors (52292555).

128693845 is a wasteful number, since it uses less digits than its factorization.

128693845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3937 (or 3930 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 128693845 is about 11344.3309630846. The cubic root of 128693845 is about 504.8773940176.

The spelling of 128693845 in words is "one hundred twenty-eight million, six hundred ninety-three thousand, eight hundred forty-five".