667420 has 48 divisors (see below), whose sum is σ = 1608768. Its totient is φ = 230400.

The previous prime is 667417. The next prime is 667421. The reversal of 667420 is 24766.

667420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4345 + ... + 4495.

It is an arithmetic number, because the mean of its divisors is an integer number (33516).

2⁶⁶⁷⁴²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804384).

667420 is an abundant number, since it is smaller than the sum of its proper divisors (941348).

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

667420 is a wasteful number, since it uses less digits than its factorization.

667420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 667420 is about 816.9577712465. The cubic root of 667420 is about 87.3909389514.

The spelling of 667420 in words is "six hundred sixty-seven thousand, four hundred twenty".