64042729 has 2 divisors, whose sum is σ = 64042730. Its totient is φ = 64042728.

The previous prime is 64042703. The next prime is 64042739. The reversal of 64042729 is 92724046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42928704 + 21114025 = 6552^2 + 4595^2 .

It is a cyclic number.

It is not a de Polignac number, because 64042729 - 2¹⁵ = 64009961 is a prime.

It is a super-2 number, since 2×64042729² = 8202942275534882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64042694 and 64042703.

It is not a weakly prime, because it can be changed into another prime (64042739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32021364 + 32021365.

It is an arithmetic number, because the mean of its divisors is an integer number (32021365).

Almost surely, 2^64042729 is an apocalyptic number.

It is an amenable number.

64042729 is a deficient number, since it is larger than the sum of its proper divisors (1).

64042729 is an equidigital number, since it uses as much as digits as its factorization.

64042729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 64042729 is about 8002.6701169047. The cubic root of 64042729 is about 400.0889989465.

The spelling of 64042729 in words is "sixty-four million, forty-two thousand, seven hundred twenty-nine".