671578 has 8 divisors (see below), whose sum is σ = 1011060. Its totient is φ = 334560.

The previous prime is 671557. The next prime is 671581. The reversal of 671578 is 875176.

671578 is nontrivially palindromic in base 7.

It can be written as a sum of positive squares in 2 ways, for example, as 660969 + 10609 = 813^2 + 103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

671578 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 408 + ... + 1228.

2⁶⁷¹⁵⁷⁸ is an apocalyptic number.

671578 is a deficient number, since it is larger than the sum of its proper divisors (339482).

671578 is a wasteful number, since it uses less digits than its factorization.

671578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232.

The product of its digits is 11760, while the sum is 34.

The square root of 671578 is about 819.4986272106. The cubic root of 671578 is about 87.5720440668.

The spelling of 671578 in words is "six hundred seventy-one thousand, five hundred seventy-eight".