30726128939 has 32 divisors (see below), whose sum is σ = 36602496000. Its totient is φ = 25489900800.

The previous prime is 30726128911. The next prime is 30726128947. The reversal of 30726128939 is 93982162703.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30726128939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30726128989) 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 31 ways as a sum of consecutive naturals, for example, 654257 + ... + 699645.

It is an arithmetic number, because the mean of its divisors is an integer number (1143828000).

Almost surely, 2^30726128939 is an apocalyptic number.

30726128939 is a deficient number, since it is larger than the sum of its proper divisors (5876367061).

30726128939 is a wasteful number, since it uses less digits than its factorization.

30726128939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45539.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 30726128939 in words is "thirty billion, seven hundred twenty-six million, one hundred twenty-eight thousand, nine hundred thirty-nine".