7891044641 has 16 divisors (see below), whose sum is σ = 8414145600. Its totient is φ = 7378890048.

The previous prime is 7891044611. The next prime is 7891044643. The reversal of 7891044641 is 1464401987.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7891044641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7891044592 and 7891044601.

It is not an unprimeable number, because it can be changed into a prime (7891044643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2819855 + ... + 2822651.

It is an arithmetic number, because the mean of its divisors is an integer number (525884100).

Almost surely, 2^7891044641 is an apocalyptic number.

It is an amenable number.

7891044641 is a deficient number, since it is larger than the sum of its proper divisors (523100959).

7891044641 is a wasteful number, since it uses less digits than its factorization.

7891044641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 7891044641 is about 88831.5520578133. The cubic root of 7891044641 is about 1990.8788523189.

The spelling of 7891044641 in words is "seven billion, eight hundred ninety-one million, forty-four thousand, six hundred forty-one".