670978 has 16 divisors (see below), whose sum is σ = 1255104. Its totient is φ = 261360.

The previous prime is 670963. The next prime is 670987. The reversal of 670978 is 879076.

It is a super-2 number, since 2×670978² = 900422952968, which contains 22 as substring.

It is an unprimeable number.

670978 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 7 ways as a sum of consecutive naturals, for example, 2025 + ... + 2332.

It is an arithmetic number, because the mean of its divisors is an integer number (78444).

2⁶⁷⁰⁹⁷⁸ is an apocalyptic number.

670978 is a deficient number, since it is larger than the sum of its proper divisors (584126).

670978 is a wasteful number, since it uses less digits than its factorization.

670978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377.

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

The square root of 670978 is about 819.1324679196. The cubic root of 670978 is about 87.5459568107.

The spelling of 670978 in words is "six hundred seventy thousand, nine hundred seventy-eight".