30728507488909 has 2 divisors, whose sum is σ = 30728507488910. Its totient is φ = 30728507488908.

The previous prime is 30728507488897. The next prime is 30728507488927. The reversal of 30728507488909 is 90988470582703.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30728507488900 + 9 = 5543330^2 + 3^2 .

It is an emirp because it is prime and its reverse (90988470582703) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30728507488909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30728507488999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15364253744454 + 15364253744455.

It is an arithmetic number, because the mean of its divisors is an integer number (15364253744455).

Almost surely, 2^{30728507488909} is an apocalyptic number.

It is an amenable number.

30728507488909 is a deficient number, since it is larger than the sum of its proper divisors (1).

30728507488909 is an equidigital number, since it uses as much as digits as its factorization.

30728507488909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243855360, while the sum is 70.

The spelling of 30728507488909 in words is "thirty trillion, seven hundred twenty-eight billion, five hundred seven million, four hundred eighty-eight thousand, nine hundred nine".