671632 has 20 divisors (see below), whose sum is σ = 1401820. Its totient is φ = 309888.

The previous prime is 671609. The next prime is 671633. The reversal of 671632 is 236176.

671632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 147456 + 524176 = 384^2 + 724^2 .

It is a junction number, because it is equal to n+sod(n) for n = 671597 and 671606.

It is not an unprimeable number, because it can be changed into a prime (671633) by changing a digit.

671632 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1407 + ... + 1822.

It is an arithmetic number, because the mean of its divisors is an integer number (70091).

2⁶⁷¹⁶³² is an apocalyptic number.

It is an amenable number.

671632 is an abundant number, since it is smaller than the sum of its proper divisors (730188).

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

671632 is a wasteful number, since it uses less digits than its factorization.

671632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250 (or 3244 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 671632 is about 819.5315735223. The cubic root of 671632 is about 87.5743911576.

The spelling of 671632 in words is "six hundred seventy-one thousand, six hundred thirty-two".