71629729 has 2 divisors, whose sum is σ = 71629730. Its totient is φ = 71629728.

The previous prime is 71629711. The next prime is 71629757. The reversal of 71629729 is 92792617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 17239104 = 7375^2 + 4152^2 .

It is a cyclic number.

It is not a de Polignac number, because 71629729 - 2⁵ = 71629697 is a prime.

It is a super-2 number, since 2×71629729² = 10261636153226882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71629709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35814864 + 35814865.

It is an arithmetic number, because the mean of its divisors is an integer number (35814865).

Almost surely, 2^71629729 is an apocalyptic number.

It is an amenable number.

71629729 is a deficient number, since it is larger than the sum of its proper divisors (1).

71629729 is an equidigital number, since it uses as much as digits as its factorization.

71629729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 71629729 is about 8463.4348228128. The cubic root of 71629729 is about 415.3023953663.

The spelling of 71629729 in words is "seventy-one million, six hundred twenty-nine thousand, seven hundred twenty-nine".