128505543 has 8 divisors (see below), whose sum is σ = 175325568. Its totient is φ = 83677944.

The previous prime is 128505539. The next prime is 128505557. The reversal of 128505543 is 345505821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128505543 - 2² = 128505539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505523) 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, 497955 + ... + 498212.

It is an arithmetic number, because the mean of its divisors is an integer number (21915696).

Almost surely, 2^128505543 is an apocalyptic number.

128505543 is a deficient number, since it is larger than the sum of its proper divisors (46820025).

128505543 is an equidigital number, since it uses as much as digits as its factorization.

128505543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996213.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 128505543 is about 11336.0285373670. The cubic root of 128505543 is about 504.6310319931.

The spelling of 128505543 in words is "one hundred twenty-eight million, five hundred five thousand, five hundred forty-three".