32728431 has 8 divisors (see below), whose sum is σ = 45934720. Its totient is φ = 20670552.

The previous prime is 32728369. The next prime is 32728439. The reversal of 32728431 is 13482723.

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

It is not a de Polignac number, because 32728431 - 2¹⁷ = 32597359 is a prime.

It is a super-2 number, since 2×32728431² = 2142300391443522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32728439) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 287035 + ... + 287148.

It is an arithmetic number, because the mean of its divisors is an integer number (5741840).

Almost surely, 2^32728431 is an apocalyptic number.

32728431 is a deficient number, since it is larger than the sum of its proper divisors (13206289).

32728431 is a wasteful number, since it uses less digits than its factorization.

32728431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574205.

The product of its digits is 8064, while the sum is 30.

The square root of 32728431 is about 5720.8767684683. The cubic root of 32728431 is about 319.8711427804.

The spelling of 32728431 in words is "thirty-two million, seven hundred twenty-eight thousand, four hundred thirty-one".