667400670 has 48 divisors (see below), whose sum is σ = 1739705760. Its totient is φ = 177515712.

The previous prime is 667400663. The next prime is 667400677. The reversal of 667400670 is 76004766.

It is an interprime number because it is at equal distance from previous prime (667400663) and next prime (667400677).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667400677) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26391 + ... + 45069.

It is an arithmetic number, because the mean of its divisors is an integer number (36243870).

Almost surely, 2^667400670 is an apocalyptic number.

667400670 is an abundant number, since it is smaller than the sum of its proper divisors (1072305090).

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

667400670 is a wasteful number, since it uses less digits than its factorization.

667400670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19089 (or 19086 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 667400670 is about 25834.0989779013. The cubic root of 667400670 is about 873.9009526320.

The spelling of 667400670 in words is "six hundred sixty-seven million, four hundred thousand, six hundred seventy".