32640521 has 4 divisors (see below), whose sum is σ = 32653572. Its totient is φ = 32627472.

The previous prime is 32640481. The next prime is 32640529. The reversal of 32640521 is 12504623.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12504623 = 977 ⋅12799.

It can be written as a sum of positive squares in 2 ways, for example, as 28783225 + 3857296 = 5365^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 32640521 - 2¹⁸ = 32378377 is a prime.

It is a super-3 number, since 3×32640521³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (32640529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1466 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (8163393).

Almost surely, 2^32640521 is an apocalyptic number.

It is an amenable number.

32640521 is a deficient number, since it is larger than the sum of its proper divisors (13051).

32640521 is an equidigital number, since it uses as much as digits as its factorization.

32640521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13050.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 32640521 is about 5713.1883392726. The cubic root of 32640521 is about 319.5844900037.

The spelling of 32640521 in words is "thirty-two million, six hundred forty thousand, five hundred twenty-one".