4687632721 has 2 divisors, whose sum is σ = 4687632722. Its totient is φ = 4687632720.

The previous prime is 4687632713. The next prime is 4687632769. The reversal of 4687632721 is 1272367864.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4475610000 + 212022721 = 66900^2 + 14561^2 .

It is a cyclic number.

It is not a de Polignac number, because 4687632721 - 2³ = 4687632713 is a prime.

It is not a weakly prime, because it can be changed into another prime (4687632821) 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, 2343816360 + 2343816361.

It is an arithmetic number, because the mean of its divisors is an integer number (2343816361).

Almost surely, 2^4687632721 is an apocalyptic number.

It is an amenable number.

4687632721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4687632721 is an equidigital number, since it uses as much as digits as its factorization.

4687632721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 46.

The square root of 4687632721 is about 68466.2889384257. The cubic root of 4687632721 is about 1673.5981702227.

It can be divided in two parts, 46876 and 32721, that added together give a palindrome (79597).

The spelling of 4687632721 in words is "four billion, six hundred eighty-seven million, six hundred thirty-two thousand, seven hundred twenty-one".