671406642 has 24 divisors (see below), whose sum is σ = 1461617040. Its totient is φ = 222740280.

The previous prime is 671406641. The next prime is 671406661. The reversal of 671406642 is 246604176.

671406642 is a `hidden beast` number, since 6 + 7 + 1 + 4 + 0 + 6 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 671406597 and 671406606.

It is not an unprimeable number, because it can be changed into a prime (671406641) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 84592 + ... + 92187.

It is an arithmetic number, because the mean of its divisors is an integer number (60900710).

Almost surely, 2^671406642 is an apocalyptic number.

671406642 is an abundant number, since it is smaller than the sum of its proper divisors (790210398).

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

671406642 is a wasteful number, since it uses less digits than its factorization.

671406642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176998 (or 176995 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 671406642 is about 25911.5156252968. The cubic root of 671406642 is about 875.6459521907.

The spelling of 671406642 in words is "six hundred seventy-one million, four hundred six thousand, six hundred forty-two".