670785725 has 6 divisors (see below), whose sum is σ = 831774330. Its totient is φ = 536628560.

The previous prime is 670785667. The next prime is 670785751. The reversal of 670785725 is 527587076.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 137499076 + 533286649 = 11726^2 + 23093^2 .

It is a de Polignac number, because none of the positive numbers 2^k-670785725 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 670785725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13415690 + ... + 13415739.

It is an arithmetic number, because the mean of its divisors is an integer number (138629055).

Almost surely, 2^670785725 is an apocalyptic number.

It is an amenable number.

670785725 is a deficient number, since it is larger than the sum of its proper divisors (160988605).

670785725 is a wasteful number, since it uses less digits than its factorization.

670785725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26831439 (or 26831434 counting only the distinct ones).

The product of its (nonzero) digits is 823200, while the sum is 47.

The square root of 670785725 is about 25899.5313664167. The cubic root of 670785725 is about 875.3759364181.

The spelling of 670785725 in words is "six hundred seventy million, seven hundred eighty-five thousand, seven hundred twenty-five".