671261536 has 72 divisors (see below), whose sum is σ = 1480468752. Its totient is φ = 299270400.

The previous prime is 671261501. The next prime is 671261561. The reversal of 671261536 is 635162176.

It is a junction number, because it is equal to n+sod(n) for n = 671261495 and 671261504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203581 + ... + 206851.

It is an arithmetic number, because the mean of its divisors is an integer number (20562066).

Almost surely, 2^671261536 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 671261536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740234376).

671261536 is an abundant number, since it is smaller than the sum of its proper divisors (809207216).

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

671261536 is a wasteful number, since it uses less digits than its factorization.

671261536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3356 (or 3337 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 671261536 is about 25908.7154448074. The cubic root of 671261536 is about 875.5828654172.

The spelling of 671261536 in words is "six hundred seventy-one million, two hundred sixty-one thousand, five hundred thirty-six".