670785547 has 4 divisors (see below), whose sum is σ = 699950160. Its totient is φ = 641620936.

The previous prime is 670785503. The next prime is 670785559. The reversal of 670785547 is 745587076.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 670785547 - 2¹⁹ = 670261259 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 670785547.

It is not an unprimeable number, because it can be changed into a prime (670785047) 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, 14582272 + ... + 14582317.

It is an arithmetic number, because the mean of its divisors is an integer number (174987540).

Almost surely, 2^670785547 is an apocalyptic number.

670785547 is a deficient number, since it is larger than the sum of its proper divisors (29164613).

670785547 is a wasteful number, since it uses less digits than its factorization.

670785547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29164612.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The square root of 670785547 is about 25899.5279300608. The cubic root of 670785547 is about 875.3758589881.

The spelling of 670785547 in words is "six hundred seventy million, seven hundred eighty-five thousand, five hundred forty-seven".