30768919 has 4 divisors (see below), whose sum is σ = 30784840. Its totient is φ = 30753000.

The previous prime is 30768911. The next prime is 30768931. The reversal of 30768919 is 91986703.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 30768919 - 2³ = 30768911 is a prime.

It is a super-2 number, since 2×30768919² = 1893452752857122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30768911) 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, 4584 + ... + 9085.

It is an arithmetic number, because the mean of its divisors is an integer number (7696210).

Almost surely, 2^30768919 is an apocalyptic number.

30768919 is a deficient number, since it is larger than the sum of its proper divisors (15921).

30768919 is a wasteful number, since it uses less digits than its factorization.

30768919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15920.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 30768919 is about 5546.9738596824. The cubic root of 30768919 is about 313.3555656726.

The spelling of 30768919 in words is "thirty million, seven hundred sixty-eight thousand, nine hundred nineteen".