670999 has 4 divisors (see below), whose sum is σ = 766864. Its totient is φ = 575136.

The previous prime is 670991. The next prime is 671003. The reversal of 670999 is 999076.

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

It is a cyclic number.

It is not a de Polignac number, because 670999 - 2³ = 670991 is a prime.

670999 is a modest number, since divided by 999 gives 670 as remainder.

670999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47922 + ... + 47935.

It is an arithmetic number, because the mean of its divisors is an integer number (191716).

2⁶⁷⁰⁹⁹⁹ is an apocalyptic number.

670999 is a deficient number, since it is larger than the sum of its proper divisors (95865).

670999 is an equidigital number, since it uses as much as digits as its factorization.

670999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95864.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 670999 is about 819.1452862588. The cubic root of 670999 is about 87.5468701272.

The spelling of 670999 in words is "six hundred seventy thousand, nine hundred ninety-nine".