671620042 has 8 divisors (see below), whose sum is σ = 1007542116. Its totient is φ = 335772672.

The previous prime is 671620039. The next prime is 671620073. The reversal of 671620042 is 240026176.

It can be written as a sum of positive squares in 2 ways, for example, as 409212441 + 262407601 = 20229^2 + 16199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 19018 + ... + 41290.

Almost surely, 2^671620042 is an apocalyptic number.

671620042 is a deficient number, since it is larger than the sum of its proper divisors (335922074).

671620042 is a wasteful number, since it uses less digits than its factorization.

671620042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37352.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 671620042 is about 25915.6331583853. The cubic root of 671620042 is about 875.7387141825.

The spelling of 671620042 in words is "six hundred seventy-one million, six hundred twenty thousand, forty-two".