671480765 has 4 divisors (see below), whose sum is σ = 805776924. Its totient is φ = 537184608.

The previous prime is 671480749. The next prime is 671480779. The reversal of 671480765 is 567084176.

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 425555641 + 245925124 = 20629^2 + 15682^2 .

It is a cyclic number.

It is not a de Polignac number, because 671480765 - 2⁴ = 671480749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67148072 + ... + 67148081.

It is an arithmetic number, because the mean of its divisors is an integer number (201444231).

Almost surely, 2^671480765 is an apocalyptic number.

It is an amenable number.

671480765 is a deficient number, since it is larger than the sum of its proper divisors (134296159).

671480765 is a wasteful number, since it uses less digits than its factorization.

671480765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134296158.

The product of its (nonzero) digits is 282240, while the sum is 44.

The square root of 671480765 is about 25912.9458958259. The cubic root of 671480765 is about 875.6781746485.

The spelling of 671480765 in words is "six hundred seventy-one million, four hundred eighty thousand, seven hundred sixty-five".