47728729 has 2 divisors, whose sum is σ = 47728730. Its totient is φ = 47728728.

The previous prime is 47728721. The next prime is 47728771. The reversal of 47728729 is 92782774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47293129 + 435600 = 6877^2 + 660^2 .

It is a cyclic number.

It is not a de Polignac number, because 47728729 - 2³ = 47728721 is a prime.

It is not a weakly prime, because it can be changed into another prime (47728721) 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, 23864364 + 23864365.

It is an arithmetic number, because the mean of its divisors is an integer number (23864365).

Almost surely, 2^47728729 is an apocalyptic number.

It is an amenable number.

47728729 is a deficient number, since it is larger than the sum of its proper divisors (1).

47728729 is an equidigital number, since it uses as much as digits as its factorization.

47728729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 395136, while the sum is 46.

The square root of 47728729 is about 6908.5981935556. The cubic root of 47728729 is about 362.7381968367.

The spelling of 47728729 in words is "forty-seven million, seven hundred twenty-eight thousand, seven hundred twenty-nine".