64871573 has 4 divisors (see below), whose sum is σ = 69861708. Its totient is φ = 59881440.

The previous prime is 64871537. The next prime is 64871581. The reversal of 64871573 is 37517846.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2745649 + 62125924 = 1657^2 + 7882^2 .

It is a cyclic number.

It is not a de Polignac number, because 64871573 - 2¹² = 64867477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64871573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64271573) 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, 2495048 + ... + 2495073.

It is an arithmetic number, because the mean of its divisors is an integer number (17465427).

Almost surely, 2^64871573 is an apocalyptic number.

It is an amenable number.

64871573 is a deficient number, since it is larger than the sum of its proper divisors (4990135).

64871573 is a wasteful number, since it uses less digits than its factorization.

64871573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4990134.

The product of its digits is 141120, while the sum is 41.

The square root of 64871573 is about 8054.2891058119. The cubic root of 64871573 is about 401.8075962682.

The spelling of 64871573 in words is "sixty-four million, eight hundred seventy-one thousand, five hundred seventy-three".