7856654321 has 8 divisors (see below), whose sum is σ = 7897459584. Its totient is φ = 7815939120.

The previous prime is 7856654297. The next prime is 7856654369. The reversal of 7856654321 is 1234566587.

7856654321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7856654321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7856654371) 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 7 ways as a sum of consecutive naturals, for example, 156056 + ... + 200166.

It is an arithmetic number, because the mean of its divisors is an integer number (987182448).

Almost surely, 2^7856654321 is an apocalyptic number.

It is an amenable number.

7856654321 is a deficient number, since it is larger than the sum of its proper divisors (40805263).

7856654321 is a wasteful number, since it uses less digits than its factorization.

7856654321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45031.

The product of its digits is 1209600, while the sum is 47.

The square root of 7856654321 is about 88637.7702844561. The cubic root of 7856654321 is about 1987.9824607576.

The spelling of 7856654321 in words is "seven billion, eight hundred fifty-six million, six hundred fifty-four thousand, three hundred twenty-one".