670878 has 48 divisors (see below), whose sum is σ = 1624896. Its totient is φ = 198720.

The previous prime is 670877. The next prime is 670897. The reversal of 670878 is 878076.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670877) 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 23 ways as a sum of consecutive naturals, for example, 10968 + ... + 11028.

It is an arithmetic number, because the mean of its divisors is an integer number (33852).

2⁶⁷⁰⁸⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812448).

670878 is an abundant number, since it is smaller than the sum of its proper divisors (954018).

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

670878 is a wasteful number, since it uses less digits than its factorization.

670878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 670878 is about 819.0714254569. The cubic root of 670878 is about 87.5416074229.

It can be divided in two parts, 6708 and 78, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 670878 in words is "six hundred seventy thousand, eight hundred seventy-eight".