670987 has 2 divisors, whose sum is σ = 670988. Its totient is φ = 670986.

The previous prime is 670963. The next prime is 670991. The reversal of 670987 is 789076.

670987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 670987 - 2¹¹ = 668939 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (670487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335493 + 335494.

It is an arithmetic number, because the mean of its divisors is an integer number (335494).

2⁶⁷⁰⁹⁸⁷ is an apocalyptic number.

670987 is a deficient number, since it is larger than the sum of its proper divisors (1).

670987 is an equidigital number, since it uses as much as digits as its factorization.

670987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 670987 is about 819.1379615181. The cubic root of 670987 is about 87.5463482344.

The spelling of 670987 in words is "six hundred seventy thousand, nine hundred eighty-seven".