7928494321 has 4 divisors (see below), whose sum is σ = 8649266544. Its totient is φ = 7207722100.

The previous prime is 7928494313. The next prime is 7928494339. The reversal of 7928494321 is 1234948297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7928494321 - 2³ = 7928494313 is a prime.

It is a super-2 number, since 2×7928494321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7928494921) 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 3 ways as a sum of consecutive naturals, for example, 360386095 + ... + 360386116.

It is an arithmetic number, because the mean of its divisors is an integer number (2162316636).

Almost surely, 2^7928494321 is an apocalyptic number.

It is an amenable number.

7928494321 is a deficient number, since it is larger than the sum of its proper divisors (720772223).

7928494321 is a wasteful number, since it uses less digits than its factorization.

7928494321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720772222.

The product of its digits is 870912, while the sum is 49.

The square root of 7928494321 is about 89042.0929729305. The cubic root of 7928494321 is about 1994.0233510409.

The spelling of 7928494321 in words is "seven billion, nine hundred twenty-eight million, four hundred ninety-four thousand, three hundred twenty-one".