64663273 has 4 divisors (see below), whose sum is σ = 66240468. Its totient is φ = 63086080.

The previous prime is 64663231. The next prime is 64663279. The reversal of 64663273 is 37236646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37236646 = 2 ⋅18618323.

It can be written as a sum of positive squares in 2 ways, for example, as 25887744 + 38775529 = 5088^2 + 6227^2 .

It is a cyclic number.

It is not a de Polignac number, because 64663273 - 2¹⁷ = 64532201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64663279) 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 in 3 ways as a sum of consecutive naturals, for example, 788536 + ... + 788617.

It is an arithmetic number, because the mean of its divisors is an integer number (16560117).

Almost surely, 2^64663273 is an apocalyptic number.

It is an amenable number.

64663273 is a deficient number, since it is larger than the sum of its proper divisors (1577195).

64663273 is a wasteful number, since it uses less digits than its factorization.

64663273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577194.

The product of its digits is 108864, while the sum is 37.

The square root of 64663273 is about 8041.3477104276. The cubic root of 64663273 is about 401.3770724880.

The spelling of 64663273 in words is "sixty-four million, six hundred sixty-three thousand, two hundred seventy-three".