30816521930 has 32 divisors (see below), whose sum is σ = 56596741200. Its totient is φ = 12076826112.

The previous prime is 30816521921. The next prime is 30816521941. The reversal of 30816521930 is 3912561803.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 19443792481 + 11372729449 = 139441^2 + 106643^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334766 + ... + 416774.

Almost surely, 2^30816521930 is an apocalyptic number.

30816521930 is a deficient number, since it is larger than the sum of its proper divisors (25780219270).

30816521930 is a wasteful number, since it uses less digits than its factorization.

30816521930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82778.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 30816521930 in words is "thirty billion, eight hundred sixteen million, five hundred twenty-one thousand, nine hundred thirty".