671719642 has 12 divisors (see below), whose sum is σ = 1107505098. Its totient is φ = 305327000.

The previous prime is 671719639. The next prime is 671719651. The reversal of 671719642 is 246917176.

It can be written as a sum of positive squares in only one way, i.e., 646227241 + 25492401 = 25421^2 + 5049^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1387609 + ... + 1388092.

Almost surely, 2^671719642 is an apocalyptic number.

671719642 is a deficient number, since it is larger than the sum of its proper divisors (435785456).

671719642 is a wasteful number, since it uses less digits than its factorization.

671719642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775725 (or 2775714 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 671719642 is about 25917.5547071864. The cubic root of 671719642 is about 875.7820021822.

The spelling of 671719642 in words is "six hundred seventy-one million, seven hundred nineteen thousand, six hundred forty-two".