7891264321 has 8 divisors (see below), whose sum is σ = 7909924064. Its totient is φ = 7872621120.

The previous prime is 7891264267. The next prime is 7891264331. The reversal of 7891264321 is 1234621987.

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

It is a cyclic number.

It is not a de Polignac number, because 7891264321 - 2¹⁷ = 7891133249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7891264331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1727881 + ... + 1732441.

It is an arithmetic number, because the mean of its divisors is an integer number (988740508).

Almost surely, 2^7891264321 is an apocalyptic number.

It is an amenable number.

7891264321 is a deficient number, since it is larger than the sum of its proper divisors (18659743).

7891264321 is a wasteful number, since it uses less digits than its factorization.

7891264321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271.

The product of its digits is 145152, while the sum is 43.

The square root of 7891264321 is about 88832.7885467973. The cubic root of 7891264321 is about 1990.8973269412.

The spelling of 7891264321 in words is "seven billion, eight hundred ninety-one million, two hundred sixty-four thousand, three hundred twenty-one".