56528321 has 4 divisors (see below), whose sum is σ = 56888532. Its totient is φ = 56168112.

The previous prime is 56528317. The next prime is 56528323. The reversal of 56528321 is 12382565.

56528321 = 258² + 259² + ... + 571².

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 30924721 + 25603600 = 5561^2 + 5060^2 .

It is a cyclic number.

It is not a de Polignac number, because 56528321 - 2² = 56528317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56528323) 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, 179870 + ... + 180183.

It is an arithmetic number, because the mean of its divisors is an integer number (14222133).

Almost surely, 2^56528321 is an apocalyptic number.

It is an amenable number.

56528321 is a deficient number, since it is larger than the sum of its proper divisors (360211).

56528321 is a wasteful number, since it uses less digits than its factorization.

56528321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360210.

The product of its digits is 14400, while the sum is 32.

The square root of 56528321 is about 7518.5318380652. The cubic root of 56528321 is about 383.7856175495.

The spelling of 56528321 in words is "fifty-six million, five hundred twenty-eight thousand, three hundred twenty-one".