52640821 has 8 divisors (see below), whose sum is σ = 54432000. Its totient is φ = 50855520.

The previous prime is 52640801. The next prime is 52640827. The reversal of 52640821 is 12804625.

52640821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52640821 - 2⁹ = 52640309 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 52640821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52640827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24030 + ... + 26128.

It is an arithmetic number, because the mean of its divisors is an integer number (6804000).

Almost surely, 2^52640821 is an apocalyptic number.

It is an amenable number.

52640821 is a deficient number, since it is larger than the sum of its proper divisors (1791179).

52640821 is a wasteful number, since it uses less digits than its factorization.

52640821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 52640821 is about 7255.3994376602. The cubic root of 52640821 is about 374.7781111038.

The spelling of 52640821 in words is "fifty-two million, six hundred forty thousand, eight hundred twenty-one".