32128505 has 4 divisors (see below), whose sum is σ = 38554212. Its totient is φ = 25702800.

The previous prime is 32128483. The next prime is 32128519. The reversal of 32128505 is 50582123.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16949689 + 15178816 = 4117^2 + 3896^2 .

It is not a de Polignac number, because 32128505 - 2²² = 27934201 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212846 + ... + 3212855.

It is an arithmetic number, because the mean of its divisors is an integer number (9638553).

Almost surely, 2^32128505 is an apocalyptic number.

It is an amenable number.

32128505 is a deficient number, since it is larger than the sum of its proper divisors (6425707).

32128505 is an equidigital number, since it uses as much as digits as its factorization.

32128505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425706.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 32128505 is about 5668.2012137891. The cubic root of 32128505 is about 317.9046198132.

The spelling of 32128505 in words is "thirty-two million, one hundred twenty-eight thousand, five hundred five".