128750123 has 4 divisors (see below), whose sum is σ = 128795400. Its totient is φ = 128704848.

The previous prime is 128750119. The next prime is 128750131. The reversal of 128750123 is 321057821.

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

It is a cyclic number.

It is not a de Polignac number, because 128750123 - 2² = 128750119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128750183) 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, 18065 + ... + 24162.

It is an arithmetic number, because the mean of its divisors is an integer number (32198850).

Almost surely, 2^128750123 is an apocalyptic number.

128750123 is a deficient number, since it is larger than the sum of its proper divisors (45277).

128750123 is an equidigital number, since it uses as much as digits as its factorization.

128750123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45276.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 128750123 is about 11346.8111379365. The cubic root of 128750123 is about 504.9509778248.

The spelling of 128750123 in words is "one hundred twenty-eight million, seven hundred fifty thousand, one hundred twenty-three".