705312 has 72 divisors (see below), whose sum is σ = 2096640. Its totient is φ = 224640.

The previous prime is 705307. The next prime is 705317. The reversal of 705312 is 213507.

It is an interprime number because it is at equal distance from previous prime (705307) and next prime (705317).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705317) 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 11 ways as a sum of consecutive naturals, for example, 8889 + ... + 8967.

It is an arithmetic number, because the mean of its divisors is an integer number (29120).

2⁷⁰⁵³¹² is an apocalyptic number.

705312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 705312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1048320).

705312 is an abundant number, since it is smaller than the sum of its proper divisors (1391328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

705312 is a wasteful number, since it uses less digits than its factorization.

705312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 705312 is about 839.8285539323. The cubic root of 705312 is about 89.0144318641.

Adding to 705312 its reverse (213507), we get a palindrome (918819).

The spelling of 705312 in words is "seven hundred five thousand, three hundred twelve".