671550 has 72 divisors (see below), whose sum is σ = 1880088. Its totient is φ = 158400.

The previous prime is 671537. The next prime is 671557. The reversal of 671550 is 55176.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 671550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671557) by changing a digit.

671550 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 (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 18132 + ... + 18168.

2⁶⁷¹⁵⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940044).

671550 is an abundant number, since it is smaller than the sum of its proper divisors (1208538).

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

671550 is a wasteful number, since it uses less digits than its factorization.

671550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 671550 is about 819.4815434163. The cubic root of 671550 is about 87.5708270072.

It can be divided in two parts, 671 and 550, that added together give a palindrome (1221).

The spelling of 671550 in words is "six hundred seventy-one thousand, five hundred fifty".