671680842 has 16 divisors (see below), whose sum is σ = 1535270592. Its totient is φ = 191908800.

The previous prime is 671680739. The next prime is 671680843. The reversal of 671680842 is 248086176.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15992401 = 671680842 / (6 + 7 + 1 + 6 + 8 + 0 + 8 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 671680794 and 671680803.

It is not an unprimeable number, because it can be changed into a prime (671680843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7996159 + ... + 7996242.

It is an arithmetic number, because the mean of its divisors is an integer number (95954412).

Almost surely, 2^671680842 is an apocalyptic number.

671680842 is an abundant number, since it is smaller than the sum of its proper divisors (863589750).

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

671680842 is a wasteful number, since it uses less digits than its factorization.

671680842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15992413.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 671680842 is about 25916.8061689707. The cubic root of 671680842 is about 875.7651394944.

The spelling of 671680842 in words is "six hundred seventy-one million, six hundred eighty thousand, eight hundred forty-two".