64634873 has 2 divisors, whose sum is σ = 64634874. Its totient is φ = 64634872.

The previous prime is 64634851. The next prime is 64634909. The reversal of 64634873 is 37843646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45859984 + 18774889 = 6772^2 + 4333^2 .

It is a cyclic number.

It is not a de Polignac number, because 64634873 - 2⁶ = 64634809 is a prime.

It is a super-2 number, since 2×64634873² = 8355333615452258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64634873.

It is not a weakly prime, because it can be changed into another prime (64634173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32317436 + 32317437.

It is an arithmetic number, because the mean of its divisors is an integer number (32317437).

Almost surely, 2^64634873 is an apocalyptic number.

It is an amenable number.

64634873 is a deficient number, since it is larger than the sum of its proper divisors (1).

64634873 is an equidigital number, since it uses as much as digits as its factorization.

64634873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 41.

The square root of 64634873 is about 8039.5816433444. The cubic root of 64634873 is about 401.3183025064.

The spelling of 64634873 in words is "sixty-four million, six hundred thirty-four thousand, eight hundred seventy-three".