132728891 has 8 divisors (see below), whose sum is σ = 135053568. Its totient is φ = 130417000.

The previous prime is 132728881. The next prime is 132728909. The reversal of 132728891 is 198827231.

132728891 = T₁₈₉₈ + T₁₈₉₉ + ... + T₁₉₆₈.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-132728891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (132728881) 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, 19076 + ... + 25086.

It is an arithmetic number, because the mean of its divisors is an integer number (16881696).

Almost surely, 2^132728891 is an apocalyptic number.

132728891 is a deficient number, since it is larger than the sum of its proper divisors (2324677).

132728891 is an equidigital number, since it uses as much as digits as its factorization.

132728891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6393.

The product of its digits is 48384, while the sum is 41.

The square root of 132728891 is about 11520.8025328099. The cubic root of 132728891 is about 510.0998023317.

The spelling of 132728891 in words is "one hundred thirty-two million, seven hundred twenty-eight thousand, eight hundred ninety-one".