7864649729 has 2 divisors, whose sum is σ = 7864649730. Its totient is φ = 7864649728.

The previous prime is 7864649717. The next prime is 7864649753. The reversal of 7864649729 is 9279464687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7818096400 + 46553329 = 88420^2 + 6823^2 .

It is a cyclic number.

It is not a de Polignac number, because 7864649729 - 2²⁰ = 7863601153 is a prime.

It is not a weakly prime, because it can be changed into another prime (7864649629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932324864 + 3932324865.

It is an arithmetic number, because the mean of its divisors is an integer number (3932324865).

Almost surely, 2^7864649729 is an apocalyptic number.

It is an amenable number.

7864649729 is a deficient number, since it is larger than the sum of its proper divisors (1).

7864649729 is an equidigital number, since it uses as much as digits as its factorization.

7864649729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36578304, while the sum is 62.

The square root of 7864649729 is about 88682.8604015455. The cubic root of 7864649729 is about 1988.6565959749.

The spelling of 7864649729 in words is "seven billion, eight hundred sixty-four million, six hundred forty-nine thousand, seven hundred twenty-nine".