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664385 = 5891493
BaseRepresentation
bin10100010001101000001
31020202100212
42202031001
5132230020
622123505
75434661
oct2421501
91222325
10664385
11414187
12280595
131a3537
141341a1
15d1cc5
hexa2341

664385 has 8 divisors (see below), whose sum is σ = 806760. Its totient is φ = 525184.

The previous prime is 664381. The next prime is 664403. The reversal of 664385 is 583466.

It can be written as a sum of positive squares in 4 ways, for example, as 85264 + 579121 = 292^2 + 761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664385 - 22 = 664381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302 + ... + 1191.

It is an arithmetic number, because the mean of its divisors is an integer number (100845).

2664385 is an apocalyptic number.

It is an amenable number.

664385 is a deficient number, since it is larger than the sum of its proper divisors (142375).

664385 is a wasteful number, since it uses less digits than its factorization.

664385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587.

The product of its digits is 17280, while the sum is 32.

The square root of 664385 is about 815.0981535987. The cubic root of 664385 is about 87.2582715890.

The spelling of 664385 in words is "six hundred sixty-four thousand, three hundred eighty-five".

Divisors: 1 5 89 445 1493 7465 132877 664385