30528481 has 4 divisors (see below), whose sum is σ = 32324292. Its totient is φ = 28732672.

The previous prime is 30528469. The next prime is 30528539. The reversal of 30528481 is 18482503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18482503 = 13 ⋅1421731.

It can be written as a sum of positive squares in 2 ways, for example, as 24840256 + 5688225 = 4984^2 + 2385^2 .

It is a cyclic number.

It is not a de Polignac number, because 30528481 - 2⁷ = 30528353 is a prime.

It is a super-2 number, since 2×30528481² = 1863976304334722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30528181) 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, 897880 + ... + 897913.

It is an arithmetic number, because the mean of its divisors is an integer number (8081073).

Almost surely, 2^30528481 is an apocalyptic number.

It is an amenable number.

30528481 is a deficient number, since it is larger than the sum of its proper divisors (1795811).

30528481 is a wasteful number, since it uses less digits than its factorization.

30528481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795810.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 30528481 is about 5525.2584554933. The cubic root of 30528481 is about 312.5372107157.

The spelling of 30528481 in words is "thirty million, five hundred twenty-eight thousand, four hundred eighty-one".