670681 has 8 divisors (see below), whose sum is σ = 770400. Its totient is φ = 577440.

The previous prime is 670673. The next prime is 670693. The reversal of 670681 is 186076.

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

It is a cyclic number.

It is not a de Polignac number, because 670681 - 2³ = 670673 is a prime.

It is a super-2 number, since 2×670681² = 899626007522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1396 + ... + 1813.

It is an arithmetic number, because the mean of its divisors is an integer number (96300).

2⁶⁷⁰⁶⁸¹ is an apocalyptic number.

It is an amenable number.

670681 is a deficient number, since it is larger than the sum of its proper divisors (99719).

670681 is a wasteful number, since it uses less digits than its factorization.

670681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 670681 is about 818.9511584948. The cubic root of 670681 is about 87.5330378643.

The spelling of 670681 in words is "six hundred seventy thousand, six hundred eighty-one".