32728213 has 8 divisors (see below), whose sum is σ = 39604032. Its totient is φ = 26402496.

The previous prime is 32728207. The next prime is 32728217. The reversal of 32728213 is 31282723.

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

It is not a de Polignac number, because 32728213 - 2¹³ = 32720021 is a prime.

It is a super-2 number, since 2×32728213² = 2142271852346738, 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 (32728217) 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, 137395 + ... + 137632.

It is an arithmetic number, because the mean of its divisors is an integer number (4950504).

Almost surely, 2^32728213 is an apocalyptic number.

It is an amenable number.

32728213 is a deficient number, since it is larger than the sum of its proper divisors (6875819).

32728213 is a wasteful number, since it uses less digits than its factorization.

32728213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275051.

The product of its digits is 4032, while the sum is 28.

The square root of 32728213 is about 5720.8577154130. The cubic root of 32728213 is about 319.8704325715.

The spelling of 32728213 in words is "thirty-two million, seven hundred twenty-eight thousand, two hundred thirteen".