128945870 has 16 divisors (see below), whose sum is σ = 234712080. Its totient is φ = 50998464.

The previous prime is 128945821. The next prime is 128945879. The reversal of 128945870 is 78549821.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128945879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71552 + ... + 73331.

It is an arithmetic number, because the mean of its divisors is an integer number (14669505).

Almost surely, 2^128945870 is an apocalyptic number.

128945870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128945870 is a deficient number, since it is larger than the sum of its proper divisors (105766210).

128945870 is a wasteful number, since it uses less digits than its factorization.

128945870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144979.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 128945870 is about 11355.4335011923. The cubic root of 128945870 is about 505.2067512738.

The spelling of 128945870 in words is "one hundred twenty-eight million, nine hundred forty-five thousand, eight hundred seventy".