671543236 has 96 divisors (see below), whose sum is σ = 1541030400. Its totient is φ = 253959552.

The previous prime is 671543219. The next prime is 671543237. The reversal of 671543236 is 632345176.

It is a junction number, because it is equal to n+sod(n) for n = 671543195 and 671543204.

It is not an unprimeable number, because it can be changed into a prime (671543237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 409410 + ... + 411046.

It is an arithmetic number, because the mean of its divisors is an integer number (16052400).

Almost surely, 2^671543236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671543236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770515200).

671543236 is an abundant number, since it is smaller than the sum of its proper divisors (869487164).

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

671543236 is a wasteful number, since it uses less digits than its factorization.

671543236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698 (or 1682 counting only the distinct ones).

The product of its digits is 90720, while the sum is 37.

The square root of 671543236 is about 25914.1512691425. The cubic root of 671543236 is about 875.7053299535.

The spelling of 671543236 in words is "six hundred seventy-one million, five hundred forty-three thousand, two hundred thirty-six".