30668513 has 4 divisors (see below), whose sum is σ = 31126320. Its totient is φ = 30210708.

The previous prime is 30668509. The next prime is 30668557. The reversal of 30668513 is 31586603.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31586603 = 2543 ⋅12421.

It is a cyclic number.

It is not a de Polignac number, because 30668513 - 2² = 30668509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 30668513.

It is not an unprimeable number, because it can be changed into a prime (30668593) 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, 228803 + ... + 228936.

It is an arithmetic number, because the mean of its divisors is an integer number (7781580).

Almost surely, 2^30668513 is an apocalyptic number.

It is an amenable number.

30668513 is a deficient number, since it is larger than the sum of its proper divisors (457807).

30668513 is an equidigital number, since it uses as much as digits as its factorization.

30668513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457806.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 30668513 is about 5537.9159437463. The cubic root of 30668513 is about 313.0143440163.

The spelling of 30668513 in words is "thirty million, six hundred sixty-eight thousand, five hundred thirteen".