30928085 has 4 divisors (see below), whose sum is σ = 37113708. Its totient is φ = 24742464.

The previous prime is 30928081. The next prime is 30928087. The reversal of 30928085 is 58082903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58082903 = 67 ⋅866909.

It can be written as a sum of positive squares in 2 ways, for example, as 11444689 + 19483396 = 3383^2 + 4414^2 .

It is a cyclic number.

It is not a de Polignac number, because 30928085 - 2² = 30928081 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 (30928081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3092804 + ... + 3092813.

It is an arithmetic number, because the mean of its divisors is an integer number (9278427).

Almost surely, 2^30928085 is an apocalyptic number.

It is an amenable number.

30928085 is a deficient number, since it is larger than the sum of its proper divisors (6185623).

30928085 is an equidigital number, since it uses as much as digits as its factorization.

30928085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6185622.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 30928085 is about 5561.3024553606. The cubic root of 30928085 is about 313.8949606063.

The spelling of 30928085 in words is "thirty million, nine hundred twenty-eight thousand, eighty-five".