128206745 has 16 divisors (see below), whose sum is σ = 155520000. Its totient is φ = 101458368.

The previous prime is 128206733. The next prime is 128206747. The reversal of 128206745 is 547602821.

It is a cyclic number.

It is not a de Polignac number, because 128206745 - 2²⁴ = 111429529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128206747) 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, 267416 + ... + 267894.

It is an arithmetic number, because the mean of its divisors is an integer number (9720000).

Almost surely, 2^128206745 is an apocalyptic number.

It is an amenable number.

128206745 is a deficient number, since it is larger than the sum of its proper divisors (27313255).

128206745 is a wasteful number, since it uses less digits than its factorization.

128206745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 128206745 is about 11322.8417369493. The cubic root of 128206745 is about 504.2396098120.

The spelling of 128206745 in words is "one hundred twenty-eight million, two hundred six thousand, seven hundred forty-five".