32472721 has 8 divisors (see below), whose sum is σ = 33730920. Its totient is φ = 31223808.

The previous prime is 32472719. The next prime is 32472733. The reversal of 32472721 is 12727423.

It can be written as a sum of positive squares in 4 ways, for example, as 26122321 + 6350400 = 5111^2 + 2520^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 32472721 - 2¹ = 32472719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 32472721.

It is not an unprimeable number, because it can be changed into a prime (32472761) 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, 5275 + ... + 9631.

It is an arithmetic number, because the mean of its divisors is an integer number (4216365).

Almost surely, 2^32472721 is an apocalyptic number.

It is an amenable number.

32472721 is a deficient number, since it is larger than the sum of its proper divisors (1258199).

32472721 is a wasteful number, since it uses less digits than its factorization.

32472721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4643.

The product of its digits is 4704, while the sum is 28.

The square root of 32472721 is about 5698.4840966699. The cubic root of 32472721 is about 319.0359036249.

The spelling of 32472721 in words is "thirty-two million, four hundred seventy-two thousand, seven hundred twenty-one".