667470 has 32 divisors (see below), whose sum is σ = 1687680. Its totient is φ = 168480.

The previous prime is 667463. The next prime is 667477. The reversal of 667470 is 74766.

It is an interprime number because it is at equal distance from previous prime (667463) and next prime (667477).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667477) by changing a digit.

667470 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 16 + ... + 1155.

It is an arithmetic number, because the mean of its divisors is an integer number (52740).

2⁶⁶⁷⁴⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (843840).

667470 is an abundant number, since it is smaller than the sum of its proper divisors (1020210).

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

667470 is a wasteful number, since it uses less digits than its factorization.

667470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200.

The product of its (nonzero) digits is 7056, while the sum is 30.

The square root of 667470 is about 816.9883720103. The cubic root of 667470 is about 87.3931212044.

Subtracting from 667470 its reverse (74766), we obtain a cube (592704 = 84³).

It can be divided in two parts, 6 and 67470, that added together give a palindrome (67476).

The spelling of 667470 in words is "six hundred sixty-seven thousand, four hundred seventy".