128456543 has 4 divisors (see below), whose sum is σ = 129394320. Its totient is φ = 127518768.

The previous prime is 128456521. The next prime is 128456557. The reversal of 128456543 is 345654821.

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 128456543 - 2⁸ = 128456287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128456497 and 128456506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128456843) 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, 468683 + ... + 468956.

It is an arithmetic number, because the mean of its divisors is an integer number (32348580).

Almost surely, 2^128456543 is an apocalyptic number.

128456543 is a deficient number, since it is larger than the sum of its proper divisors (937777).

128456543 is an equidigital number, since it uses as much as digits as its factorization.

128456543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937776.

The product of its digits is 115200, while the sum is 38.

The square root of 128456543 is about 11333.8670805687. The cubic root of 128456543 is about 504.5668841400.

The spelling of 128456543 in words is "one hundred twenty-eight million, four hundred fifty-six thousand, five hundred forty-three".