30728660491 has 16 divisors (see below), whose sum is σ = 32701631040. Its totient is φ = 28809855360.

The previous prime is 30728660447. The next prime is 30728660497. The reversal of 30728660491 is 19406682703.

It is a cyclic number.

It is not a de Polignac number, because 30728660491 - 2⁹ = 30728659979 is a prime.

It is a super-2 number, since 2×30728660491² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30728660497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291321 + ... + 1314901.

It is an arithmetic number, because the mean of its divisors is an integer number (2043851940).

Almost surely, 2^30728660491 is an apocalyptic number.

30728660491 is a deficient number, since it is larger than the sum of its proper divisors (1972970549).

30728660491 is a wasteful number, since it uses less digits than its factorization.

30728660491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24726.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 30728660491 in words is "thirty billion, seven hundred twenty-eight million, six hundred sixty thousand, four hundred ninety-one".