7880920321 has 2 divisors, whose sum is σ = 7880920322. Its totient is φ = 7880920320.

The previous prime is 7880920319. The next prime is 7880920343. The reversal of 7880920321 is 1230290887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5078700225 + 2802220096 = 71265^2 + 52936^2 .

It is a cyclic number.

It is not a de Polignac number, because 7880920321 - 2¹ = 7880920319 is a prime.

Together with 7880920319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7880920351) 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 as a sum of consecutive naturals, namely, 3940460160 + 3940460161.

It is an arithmetic number, because the mean of its divisors is an integer number (3940460161).

Almost surely, 2^7880920321 is an apocalyptic number.

It is an amenable number.

7880920321 is a deficient number, since it is larger than the sum of its proper divisors (1).

7880920321 is an equidigital number, since it uses as much as digits as its factorization.

7880920321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 7880920321 is about 88774.5477093519. The cubic root of 7880920321 is about 1990.0270461716.

The spelling of 7880920321 in words is "seven billion, eight hundred eighty million, nine hundred twenty thousand, three hundred twenty-one".