671490 has 40 divisors (see below), whose sum is σ = 1807740. Its totient is φ = 178848.

The previous prime is 671477. The next prime is 671501. The reversal of 671490 is 94176.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 729 = 819^2 + 27^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 671490.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 396 + ... + 1224.

671490 is a Friedman number, since it can be written as 74610*9, using all its digits and the basic arithmetic operations.

2⁶⁷¹⁴⁹⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903870).

671490 is an abundant number, since it is smaller than the sum of its proper divisors (1136250).

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

671490 is a wasteful number, since it uses less digits than its factorization.

671490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 839 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 671490 is about 819.4449340865. Note that the first 3 decimals coincide. The cubic root of 671490 is about 87.5682189085.

The spelling of 671490 in words is "six hundred seventy-one thousand, four hundred ninety".