671544 has 32 divisors (see below), whose sum is σ = 1866000. Its totient is φ = 223776.

The previous prime is 671537. The next prime is 671557. The reversal of 671544 is 445176.

671544 = 48² + 49² + ... + 128².

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

It is a nialpdrome in base 6.

It is a congruent number.

It is an unprimeable number.

671544 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1339 + ... + 1770.

2⁶⁷¹⁵⁴⁴ is an apocalyptic number.

It is an amenable number.

671544 is an abundant number, since it is smaller than the sum of its proper divisors (1194456).

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

671544 is a wasteful number, since it uses less digits than its factorization.

671544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124 (or 3114 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 671544 is about 819.4778825569. The cubic root of 671544 is about 87.5705662044.

The spelling of 671544 in words is "six hundred seventy-one thousand, five hundred forty-four".