7993561389 has 64 divisors (see below), whose sum is σ = 12292300800. Its totient is φ = 4575916800.

The previous prime is 7993561343. The next prime is 7993561439. The reversal of 7993561389 is 9831653997.

It is not a de Polignac number, because 7993561389 - 2⁹ = 7993560877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7993161389) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20548807 + ... + 20549195.

It is an arithmetic number, because the mean of its divisors is an integer number (192067200).

Almost surely, 2^7993561389 is an apocalyptic number.

It is an amenable number.

7993561389 is a deficient number, since it is larger than the sum of its proper divisors (4298739411).

7993561389 is a wasteful number, since it uses less digits than its factorization.

7993561389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866.

The product of its digits is 11022480, while the sum is 60.

The square root of 7993561389 is about 89406.7189253694. The cubic root of 7993561389 is about 1999.4633050755.

It can be divided in two parts, 799356 and 1389, that added together give a triangular number (800745 = T₁₂₆₅).

The spelling of 7993561389 in words is "seven billion, nine hundred ninety-three million, five hundred sixty-one thousand, three hundred eighty-nine".