67718640 has 160 divisors (see below), whose sum is σ = 232056576. Its totient is φ = 16199680.

The previous prime is 67718639. The next prime is 67718657. The reversal of 67718640 is 4681776.

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 31 ways as a sum of consecutive naturals, for example, 298207 + ... + 298433.

Almost surely, 2^67718640 is an apocalyptic number.

67718640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67718640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116028288).

67718640 is an abundant number, since it is smaller than the sum of its proper divisors (164337936).

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

67718640 is a wasteful number, since it uses less digits than its factorization.

67718640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 67718640 is about 8229.1336117480. The cubic root of 67718640 is about 407.6017837007.

The spelling of 67718640 in words is "sixty-seven million, seven hundred eighteen thousand, six hundred forty".