64739 has 4 divisors (see below), whose sum is σ = 66360. Its totient is φ = 63120.

The previous prime is 64717. The next prime is 64747. The reversal of 64739 is 93746.

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 64739 - 2⁸ = 64483 is a prime.

It is a super-2 number, since 2×64739² = 8382276242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6⁶ + 4⁵ + 7⁵ + 3⁵ + 9 .

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (64709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749 + ... + 830.

It is an arithmetic number, because the mean of its divisors is an integer number (16590).

2⁶⁴⁷³⁹ is an apocalyptic number.

64739 is a deficient number, since it is larger than the sum of its proper divisors (1621).

64739 is a wasteful number, since it uses less digits than its factorization.

64739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its digits is 4536, while the sum is 29.

The square root of 64739 is about 254.4385977009. The cubic root of 64739 is about 40.1533695265.

It can be divided in two parts, 647 and 39, that added together give a palindrome (686).

The spelling of 64739 in words is "sixty-four thousand, seven hundred thirty-nine".