64735861 has 2 divisors, whose sum is σ = 64735862. Its totient is φ = 64735860.

The previous prime is 64735819. The next prime is 64735871. The reversal of 64735861 is 16853746.

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., 59582961 + 5152900 = 7719^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 64735861 - 2¹¹ = 64733813 is a prime.

It is a super-2 number, since 2×64735861² = 8381463398822642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64735871) 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, 32367930 + 32367931.

It is an arithmetic number, because the mean of its divisors is an integer number (32367931).

Almost surely, 2^64735861 is an apocalyptic number.

It is an amenable number.

64735861 is a deficient number, since it is larger than the sum of its proper divisors (1).

64735861 is an equidigital number, since it uses as much as digits as its factorization.

64735861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 64735861 is about 8045.8598670372. The cubic root of 64735861 is about 401.5272054381.

The spelling of 64735861 in words is "sixty-four million, seven hundred thirty-five thousand, eight hundred sixty-one".