67640670 has 80 divisors (see below), whose sum is σ = 183736080. Its totient is φ = 17853696.

The previous prime is 67640663. The next prime is 67640687. The reversal of 67640670 is 7604676.

67640670 is a `hidden beast` number, since 6 + 7 + 640 + 6 + 7 + 0 = 666.

It is a congruent number.

It is an unprimeable 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 39 ways as a sum of consecutive naturals, for example, 91161 + ... + 91899.

It is an arithmetic number, because the mean of its divisors is an integer number (2296701).

Almost surely, 2^67640670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67640670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91868040).

67640670 is an abundant number, since it is smaller than the sum of its proper divisors (116095410).

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

67640670 is a wasteful number, since it uses less digits than its factorization.

67640670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 862 counting only the distinct ones).

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

The square root of 67640670 is about 8224.3948105621. The cubic root of 67640670 is about 407.4452885509.

The spelling of 67640670 in words is "sixty-seven million, six hundred forty thousand, six hundred seventy".