671520042 has 12 divisors (see below), whose sum is σ = 1454960130. Its totient is φ = 223840008.

The previous prime is 671520023. The next prime is 671520053. The reversal of 671520042 is 240025176.

It can be written as a sum of positive squares in only one way, i.e., 618069321 + 53450721 = 24861^2 + 7311^2 .

It is a junction number, because it is equal to n+sod(n) for n = 671519988 and 671520015.

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, 18653317 + ... + 18653352.

Almost surely, 2^671520042 is an apocalyptic number.

671520042 is an abundant number, since it is smaller than the sum of its proper divisors (783440088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671520042 is a wasteful number, since it uses less digits than its factorization.

671520042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37306677 (or 37306674 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 671520042 is about 25913.7037491749. The cubic root of 671520042 is about 875.6952480297.

The spelling of 671520042 in words is "six hundred seventy-one million, five hundred twenty thousand, forty-two".