705655 has 4 divisors (see below), whose sum is σ = 846792. Its totient is φ = 564520.

The previous prime is 705643. The next prime is 705689. The reversal of 705655 is 556507.

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

It is a de Polignac number, because none of the positive numbers 2^k-705655 is a prime.

It is a Duffinian number.

705655 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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, 70561 + ... + 70570.

It is an arithmetic number, because the mean of its divisors is an integer number (211698).

2⁷⁰⁵⁶⁵⁵ is an apocalyptic number.

705655 is a deficient number, since it is larger than the sum of its proper divisors (141137).

705655 is a wasteful number, since it uses less digits than its factorization.

705655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141136.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 705655 is about 840.0327374573. The cubic root of 705655 is about 89.0288590501.

The spelling of 705655 in words is "seven hundred five thousand, six hundred fifty-five".