667870 has 48 divisors (see below), whose sum is σ = 1477440. Its totient is φ = 216384.

The previous prime is 667867. The next prime is 667883. The reversal of 667870 is 78766.

667870 = T₁₄₀ + T₁₄₁ + ... + T₁₈₈.

667870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14187 + ... + 14233.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2⁶⁶⁷⁸⁷⁰ is an apocalyptic number.

667870 is an abundant number, since it is smaller than the sum of its proper divisors (809570).

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

667870 is a wasteful number, since it uses less digits than its factorization.

667870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 667870 is about 817.2331368710. The cubic root of 667870 is about 87.4105753061.

It can be divided in two parts, 6 and 67870, that added together give a palindrome (67876).

The spelling of 667870 in words is "six hundred sixty-seven thousand, eight hundred seventy".