7920321875 has 12 divisors (see below), whose sum is σ = 9899772624. Its totient is φ = 6336255000.

The previous prime is 7920321839. The next prime is 7920321907. The reversal of 7920321875 is 5781230297.

It is a de Polignac number, because none of the positive numbers 2^k-7920321875 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1264127 + ... + 1270376.

It is an arithmetic number, because the mean of its divisors is an integer number (824981052).

Almost surely, 2^7920321875 is an apocalyptic number.

7920321875 is a deficient number, since it is larger than the sum of its proper divisors (1979450749).

7920321875 is an frugal number, since it uses more digits than its factorization.

7920321875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534528 (or 2534508 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 7920321875 is about 88996.1902274474. The cubic root of 7920321875 is about 1993.3379896990.

The spelling of 7920321875 in words is "seven billion, nine hundred twenty million, three hundred twenty-one thousand, eight hundred seventy-five".