67947640 has 32 divisors (see below), whose sum is σ = 161876880. Its totient is φ = 25580032.

The previous prime is 67947631. The next prime is 67947661. The reversal of 67947640 is 4674976.

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 7 ways as a sum of consecutive naturals, for example, 49282 + ... + 50641.

Almost surely, 2^67947640 is an apocalyptic number.

It is an amenable number.

67947640 is an abundant number, since it is smaller than the sum of its proper divisors (93929240).

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

67947640 is a wasteful number, since it uses less digits than its factorization.

67947640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99951 (or 99947 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The square root of 67947640 is about 8243.0358485209. The cubic root of 67947640 is about 408.0607208102.

The spelling of 67947640 in words is "sixty-seven million, nine hundred forty-seven thousand, six hundred forty".