32740721 has 4 divisors (see below), whose sum is σ = 35259252. Its totient is φ = 30222192.

The previous prime is 32740709. The next prime is 32740723. The reversal of 32740721 is 12704723.

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 16900321 + 15840400 = 4111^2 + 3980^2 .

It is not a de Polignac number, because 32740721 - 2¹⁸ = 32478577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (32740723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1259246 + ... + 1259271.

It is an arithmetic number, because the mean of its divisors is an integer number (8814813).

Almost surely, 2^32740721 is an apocalyptic number.

It is an amenable number.

32740721 is a deficient number, since it is larger than the sum of its proper divisors (2518531).

32740721 is a wasteful number, since it uses less digits than its factorization.

32740721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518530.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 32740721 is about 5721.9508037032. The cubic root of 32740721 is about 319.9111765191.

The spelling of 32740721 in words is "thirty-two million, seven hundred forty thousand, seven hundred twenty-one".