670746805 has 4 divisors (see below), whose sum is σ = 804896172. Its totient is φ = 536597440.

The previous prime is 670746779. The next prime is 670746827. The reversal of 670746805 is 508647076.

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 236482884 + 434263921 = 15378^2 + 20839^2 .

It is not a de Polignac number, because 670746805 - 2⁵ = 670746773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67074676 + ... + 67074685.

It is an arithmetic number, because the mean of its divisors is an integer number (201224043).

Almost surely, 2^670746805 is an apocalyptic number.

It is an amenable number.

670746805 is a deficient number, since it is larger than the sum of its proper divisors (134149367).

670746805 is a wasteful number, since it uses less digits than its factorization.

670746805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134149366.

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 670746805 is about 25898.7799905710. The cubic root of 670746805 is about 875.3590058797.

The spelling of 670746805 in words is "six hundred seventy million, seven hundred forty-six thousand, eight hundred five".