7832256721 has 2 divisors, whose sum is σ = 7832256722. Its totient is φ = 7832256720.

The previous prime is 7832256697. The next prime is 7832256763. The reversal of 7832256721 is 1276522387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5694211600 + 2138045121 = 75460^2 + 46239^2 .

It is a cyclic number.

It is not a de Polignac number, because 7832256721 - 2¹¹ = 7832254673 is a prime.

It is a super-2 number, since 2×7832256721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7832256781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3916128360 + 3916128361.

It is an arithmetic number, because the mean of its divisors is an integer number (3916128361).

Almost surely, 2^7832256721 is an apocalyptic number.

It is an amenable number.

7832256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7832256721 is an equidigital number, since it uses as much as digits as its factorization.

7832256721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 7832256721 is about 88500.0379717433. The cubic root of 7832256721 is about 1985.9225384380.

The spelling of 7832256721 in words is "seven billion, eight hundred thirty-two million, two hundred fifty-six thousand, seven hundred twenty-one".