30528013 has 4 divisors (see below), whose sum is σ = 30578428. Its totient is φ = 30477600.

The previous prime is 30528011. The next prime is 30528119. The reversal of 30528013 is 31082503.

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 3674889 + 26853124 = 1917^2 + 5182^2 .

It is a cyclic number.

It is not a de Polignac number, because 30528013 - 2¹ = 30528011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30528011) 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, 24288 + ... + 25513.

It is an arithmetic number, because the mean of its divisors is an integer number (7644607).

Almost surely, 2^30528013 is an apocalyptic number.

It is an amenable number.

30528013 is a deficient number, since it is larger than the sum of its proper divisors (50415).

30528013 is an equidigital number, since it uses as much as digits as its factorization.

30528013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50414.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 30528013 is about 5525.2161043709. The cubic root of 30528013 is about 312.5356136479.

The spelling of 30528013 in words is "thirty million, five hundred twenty-eight thousand, thirteen".