667040 has 48 divisors (see below), whose sum is σ = 1723680. Its totient is φ = 241920.

The previous prime is 667021. The next prime is 667081. The reversal of 667040 is 40766.

It is a junction number, because it is equal to n+sod(n) for n = 666997 and 667015.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1571 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (35910).

2⁶⁶⁷⁰⁴⁰ 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 667040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861840).

667040 is an abundant number, since it is smaller than the sum of its proper divisors (1056640).

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

667040 is a wasteful number, since it uses less digits than its factorization.

667040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 667040 is about 816.7251679727. The cubic root of 667040 is about 87.3743502660.

The spelling of 667040 in words is "six hundred sixty-seven thousand, forty".