671648 has 24 divisors (see below), whose sum is σ = 1340640. Its totient is φ = 331200.

The previous prime is 671647. The next prime is 671651. The reversal of 671648 is 846176.

Added to its reverse (846176) it gives a square (1517824 = 1232²).

671648 = T₆₇ + T₆₈ + ... + T₁₆₂.

671648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×671648² = 902222071808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (671647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4373 + ... + 4523.

It is an arithmetic number, because the mean of its divisors is an integer number (55860).

2⁶⁷¹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

671648 is a deficient number, since it is larger than the sum of its proper divisors (668992).

671648 is a wasteful number, since it uses less digits than its factorization.

671648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 292 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 671648 is about 819.5413351381. The cubic root of 671648 is about 87.5750865678.

Adding to 671648 its reverse (846176), we get a square (1517824 = 1232²).

The spelling of 671648 in words is "six hundred seventy-one thousand, six hundred forty-eight".