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64445 = 512889
BaseRepresentation
bin1111101110111101
310021101212
433232331
54030240
61214205
7355613
oct175675
9107355
1064445
1144467
1231365
1323444
14196b3
1514165
hexfbbd

64445 has 4 divisors (see below), whose sum is σ = 77340. Its totient is φ = 51552.

The previous prime is 64439. The next prime is 64451. The reversal of 64445 is 54446.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (64439) and next prime (64451).

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 31684 = 181^2 + 178^2 .

It is a cyclic number.

It is not a de Polignac number, because 64445 - 26 = 64381 is a prime.

It is a d-powerful number, because it can be written as 66 + 44 + 45 + 47 + 53 .

It is a plaindrome in base 11 and base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 64445.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64445.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6440 + ... + 6449.

It is an arithmetic number, because the mean of its divisors is an integer number (19335).

264445 is an apocalyptic number.

It is an amenable number.

64445 is a deficient number, since it is larger than the sum of its proper divisors (12895).

64445 is a wasteful number, since it uses less digits than its factorization.

64445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12894.

The product of its digits is 1920, while the sum is 23.

The square root of 64445 is about 253.8601977467. The cubic root of 64445 is about 40.0924942886.

Subtracting from 64445 its reverse (54446), we obtain a palindrome (9999).

The spelling of 64445 in words is "sixty-four thousand, four hundred forty-five".

Divisors: 1 5 12889 64445