30728910520 has 128 divisors (see below), whose sum is σ = 90737625600. Its totient is φ = 9073728000.

The previous prime is 30728910481. The next prime is 30728910523. The reversal of 30728910520 is 2501982703.

It is a self number, because there is not a number n which added to its sum of digits gives 30728910520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30728910523) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204031 + ... + 321070.

It is an arithmetic number, because the mean of its divisors is an integer number (708887700).

Almost surely, 2^30728910520 is an apocalyptic number.

It is an amenable number.

30728910520 is an abundant number, since it is smaller than the sum of its proper divisors (60008715080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

30728910520 is a wasteful number, since it uses less digits than its factorization.

30728910520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525149 (or 525145 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 30728910520 in words is "thirty billion, seven hundred twenty-eight million, nine hundred ten thousand, five hundred twenty".