671790 has 48 divisors (see below), whose sum is σ = 1879632. Its totient is φ = 153216.

The previous prime is 671779. The next prime is 671791. The reversal of 671790 is 97176.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671791) by changing a digit.

671790 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1242 + ... + 1698.

It is an arithmetic number, because the mean of its divisors is an integer number (39159).

2⁶⁷¹⁷⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939816).

671790 is an abundant number, since it is smaller than the sum of its proper divisors (1207842).

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

671790 is a wasteful number, since it uses less digits than its factorization.

671790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 671790 is about 819.6279643838. The cubic root of 671790 is about 87.5812578490.

The spelling of 671790 in words is "six hundred seventy-one thousand, seven hundred ninety".