671019642 has 96 divisors (see below), whose sum is σ = 1543651200. Its totient is φ = 210418560.

The previous prime is 671019623. The next prime is 671019647. The reversal of 671019642 is 246910176.

671019642 is a `hidden beast` number, since 6 + 7 + 1 + 0 + 1 + 9 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 671019597 and 671019606.

It is not an unprimeable number, because it can be changed into a prime (671019647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3371859 + ... + 3372057.

It is an arithmetic number, because the mean of its divisors is an integer number (16079700).

Almost surely, 2^671019642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671019642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771825600).

671019642 is an abundant number, since it is smaller than the sum of its proper divisors (872631558).

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

671019642 is a wasteful number, since it uses less digits than its factorization.

671019642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 671019642 is about 25904.0468267026. The cubic root of 671019642 is about 875.4776785532.

The spelling of 671019642 in words is "six hundred seventy-one million, nineteen thousand, six hundred forty-two".