67987640 has 32 divisors (see below), whose sum is σ = 174826080. Its totient is φ = 23309952.

The previous prime is 67987631. The next prime is 67987649. The reversal of 67987640 is 4678976.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67987631) and next prime (67987649).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67987649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 121127 + ... + 121686.

It is an arithmetic number, because the mean of its divisors is an integer number (5463315).

Almost surely, 2^67987640 is an apocalyptic number.

It is an amenable number.

67987640 is an abundant number, since it is smaller than the sum of its proper divisors (106838440).

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

67987640 is a wasteful number, since it uses less digits than its factorization.

67987640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242831 (or 242827 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 67987640 is about 8245.4617820957. The cubic root of 67987640 is about 408.1407786653.

The spelling of 67987640 in words is "sixty-seven million, nine hundred eighty-seven thousand, six hundred forty".