64893671 has 4 divisors (see below), whose sum is σ = 66647592. Its totient is φ = 63139752.

The previous prime is 64893643. The next prime is 64893713. The reversal of 64893671 is 17639846.

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

It is a cyclic number.

It is not a de Polignac number, because 64893671 - 2¹⁰ = 64892647 is a prime.

It is a super-2 number, since 2×64893671² = 8422377071712482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890671) 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, 876905 + ... + 876978.

It is an arithmetic number, because the mean of its divisors is an integer number (16661898).

Almost surely, 2^64893671 is an apocalyptic number.

64893671 is a deficient number, since it is larger than the sum of its proper divisors (1753921).

64893671 is a wasteful number, since it uses less digits than its factorization.

64893671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753920.

The product of its digits is 217728, while the sum is 44.

The square root of 64893671 is about 8055.6608046764. The cubic root of 64893671 is about 401.8532153061.

The spelling of 64893671 in words is "sixty-four million, eight hundred ninety-three thousand, six hundred seventy-one".