30728686999 has 4 divisors (see below), whose sum is σ = 30744216360. Its totient is φ = 30713157640.

The previous prime is 30728686927. The next prime is 30728687009. The reversal of 30728686999 is 99968682703.

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 30728686999 - 2²⁹ = 30191816087 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 (30728686799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7761712 + ... + 7765669.

It is an arithmetic number, because the mean of its divisors is an integer number (7686054090).

Almost surely, 2^30728686999 is an apocalyptic number.

30728686999 is a deficient number, since it is larger than the sum of its proper divisors (15529361).

30728686999 is a wasteful number, since it uses less digits than its factorization.

30728686999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15529360.

The product of its (nonzero) digits is 70543872, while the sum is 67.

The spelling of 30728686999 in words is "thirty billion, seven hundred twenty-eight million, six hundred eighty-six thousand, nine hundred ninety-nine".