64321679 has 4 divisors (see below), whose sum is σ = 65817576. Its totient is φ = 62825784.

The previous prime is 64321667. The next prime is 64321711. The reversal of 64321679 is 97612346.

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 64321679 - 2⁸ = 64321423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64321619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747884 + ... + 747969.

It is an arithmetic number, because the mean of its divisors is an integer number (16454394).

Almost surely, 2^64321679 is an apocalyptic number.

64321679 is a deficient number, since it is larger than the sum of its proper divisors (1495897).

64321679 is a wasteful number, since it uses less digits than its factorization.

64321679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495896.

The product of its digits is 54432, while the sum is 38.

The square root of 64321679 is about 8020.0797377582. The cubic root of 64321679 is about 400.6690449067.

It can be divided in two parts, 643 and 21679, that added together give a palindrome (22322).

The spelling of 64321679 in words is "sixty-four million, three hundred twenty-one thousand, six hundred seventy-nine".