671698 has 16 divisors (see below), whose sum is σ = 1073880. Its totient is φ = 314496.

The previous prime is 671681. The next prime is 671701. The reversal of 671698 is 896176.

671698 is nontrivially palindromic in base 3 and base 15.

It can be written as a sum of positive squares in 4 ways, for example, as 514089 + 157609 = 717^2 + 397^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1990 + ... + 2302.

2⁶⁷¹⁶⁹⁸ is an apocalyptic number.

671698 is a deficient number, since it is larger than the sum of its proper divisors (402182).

671698 is a wasteful number, since it uses less digits than its factorization.

671698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381.

The product of its digits is 18144, while the sum is 37.

The square root of 671698 is about 819.5718394381. The cubic root of 671698 is about 87.5772596533.

It can be divided in two parts, 671 and 698, that added together give a square (1369 = 37²).

The spelling of 671698 in words is "six hundred seventy-one thousand, six hundred ninety-eight".