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64309 = 79187

64309 has 4 divisors (see below), whose sum is σ = 73504. Its totient is φ = 55116.

The previous prime is 64303. The next prime is 64319. The reversal of 64309 is 90346.

It can be divided in two parts, 64 and 309, that added together give a palindrome (373).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64309 - 23 = 64301 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 64309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64301) 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, 4587 + ... + 4600.

It is an arithmetic number, because the mean of its divisors is an integer number (18376).

264309 is an apocalyptic number.

It is an amenable number.

64309 is a deficient number, since it is larger than the sum of its proper divisors (9195).

64309 is an equidigital number, since it uses as much as digits as its factorization.

64309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 64309 is about 253.5921923088. The cubic root of 64309 is about 40.0642716735.

The spelling of 64309 in words is "sixty-four thousand, three hundred nine".

Divisors: 1 7 9187 64309