64550729 has 2 divisors, whose sum is σ = 64550730. Its totient is φ = 64550728.

The previous prime is 64550659. The next prime is 64550737. The reversal of 64550729 is 92705546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45427600 + 19123129 = 6740^2 + 4373^2 .

It is a cyclic number.

It is not a de Polignac number, because 64550729 - 2¹⁶ = 64485193 is a prime.

It is a super-2 number, since 2×64550729² = 8333593228862882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64550692 and 64550701.

It is not a weakly prime, because it can be changed into another prime (64550789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32275364 + 32275365.

It is an arithmetic number, because the mean of its divisors is an integer number (32275365).

Almost surely, 2^64550729 is an apocalyptic number.

It is an amenable number.

64550729 is a deficient number, since it is larger than the sum of its proper divisors (1).

64550729 is an equidigital number, since it uses as much as digits as its factorization.

64550729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 64550729 is about 8034.3468309502. The cubic root of 64550729 is about 401.1440766849.

The spelling of 64550729 in words is "sixty-four million, five hundred fifty thousand, seven hundred twenty-nine".