30820644494639 has 24 divisors (see below), whose sum is σ = 31944177353088. Its totient is φ = 29734981493760.

The previous prime is 30820644494597. The next prime is 30820644494659. The reversal of 30820644494639 is 93649444602803.

It is not a de Polignac number, because 30820644494639 - 2³² = 30816349527343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30820644494659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76672994 + ... + 77073920.

It is an arithmetic number, because the mean of its divisors is an integer number (1331007389712).

Almost surely, 2^{30820644494639} is an apocalyptic number.

30820644494639 is a deficient number, since it is larger than the sum of its proper divisors (1123532858449).

30820644494639 is a wasteful number, since it uses less digits than its factorization.

30820644494639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401475 (or 401438 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 62.

The spelling of 30820644494639 in words is "thirty trillion, eight hundred twenty billion, six hundred forty-four million, four hundred ninety-four thousand, six hundred thirty-nine".