670765 has 4 divisors (see below), whose sum is σ = 804924. Its totient is φ = 536608.

The previous prime is 670763. The next prime is 670777. The reversal of 670765 is 567076.

670765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 243049 + 427716 = 493^2 + 654^2 .

It is a cyclic number.

It is not a de Polignac number, because 670765 - 2¹ = 670763 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

670765 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67072 + ... + 67081.

It is an arithmetic number, because the mean of its divisors is an integer number (201231).

2⁶⁷⁰⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

670765 is a deficient number, since it is larger than the sum of its proper divisors (134159).

670765 is a wasteful number, since it uses less digits than its factorization.

670765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134158.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 670765 is about 819.0024419988. The cubic root of 670765 is about 87.5366920944.

It can be divided in two parts, 67076 and 5, that added together give a square (67081 = 259²).

The spelling of 670765 in words is "six hundred seventy thousand, seven hundred sixty-five".