671625605 has 24 divisors (see below), whose sum is σ = 938679192. Its totient is φ = 459981312.

The previous prime is 671625601. The next prime is 671625607. The reversal of 671625605 is 506526176.

It can be written as a sum of positive squares in 4 ways, for example, as 285542404 + 386083201 = 16898^2 + 19649^2 .

It is not a de Polignac number, because 671625605 - 2² = 671625601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671625601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350129 + ... + 352041.

It is an arithmetic number, because the mean of its divisors is an integer number (39111633).

Almost surely, 2^671625605 is an apocalyptic number.

It is an amenable number.

671625605 is a deficient number, since it is larger than the sum of its proper divisors (267053587).

671625605 is a wasteful number, since it uses less digits than its factorization.

671625605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3365 (or 3358 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 671625605 is about 25915.7404872020. The cubic root of 671625605 is about 875.7411320779.

The spelling of 671625605 in words is "six hundred seventy-one million, six hundred twenty-five thousand, six hundred five".