670842 has 40 divisors (see below), whose sum is σ = 1555092. Its totient is φ = 216000.

The previous prime is 670823. The next prime is 670849. The reversal of 670842 is 248076.

It can be written as a sum of positive squares in 2 ways, for example, as 670761 + 81 = 819^2 + 9^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (670849) 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 19 ways as a sum of consecutive naturals, for example, 6592 + ... + 6692.

2⁶⁷⁰⁸⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777546).

670842 is an abundant number, since it is smaller than the sum of its proper divisors (884250).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

670842 is a wasteful number, since it uses less digits than its factorization.

670842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 670842 is about 819.0494490566. The cubic root of 670842 is about 87.5400415374.

The spelling of 670842 in words is "six hundred seventy thousand, eight hundred forty-two".