671809536 has 204 divisors, whose sum is σ = 2085601752. Its totient is φ = 207618048.

The previous prime is 671809529. The next prime is 671809549. The reversal of 671809536 is 635908176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (204).

It is a junction number, because it is equal to n+sod(n) for n = 671809491 and 671809500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10026975 + ... + 10027041.

It is an arithmetic number, because the mean of its divisors is an integer number (10223538).

Almost surely, 2^671809536 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 671809536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1042800876).

671809536 is an abundant number, since it is smaller than the sum of its proper divisors (1413792216).

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

671809536 is an equidigital number, since it uses as much as digits as its factorization.

671809536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 671809536 is about 25919.2888791340. The cubic root of 671809536 is about 875.8210681014.

The spelling of 671809536 in words is "six hundred seventy-one million, eight hundred nine thousand, five hundred thirty-six".