671618 has 4 divisors (see below), whose sum is σ = 1007430. Its totient is φ = 335808.

The previous prime is 671609. The next prime is 671633. The reversal of 671618 is 816176.

671618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 418609 + 253009 = 647^2 + 503^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167903 + ... + 167906.

2⁶⁷¹⁶¹⁸ is an apocalyptic number.

671618 is a deficient number, since it is larger than the sum of its proper divisors (335812).

671618 is a wasteful number, since it uses less digits than its factorization.

671618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335811.

The product of its digits is 2016, while the sum is 29.

The square root of 671618 is about 819.5230320131. The cubic root of 671618 is about 87.5737826647.

The spelling of 671618 in words is "six hundred seventy-one thousand, six hundred eighteen".