67940728 has 8 divisors (see below), whose sum is σ = 127388880. Its totient is φ = 33970360.

The previous prime is 67940723. The next prime is 67940737. The reversal of 67940728 is 82704976.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×67940728³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67940723) 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 as a sum of consecutive naturals, namely, 4246288 + ... + 4246303.

It is an arithmetic number, because the mean of its divisors is an integer number (15923610).

Almost surely, 2^67940728 is an apocalyptic number.

It is an amenable number.

67940728 is a deficient number, since it is larger than the sum of its proper divisors (59448152).

67940728 is a wasteful number, since it uses less digits than its factorization.

67940728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492597 (or 8492593 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 67940728 is about 8242.6165748505. The cubic root of 67940728 is about 408.0468836294.

The spelling of 67940728 in words is "sixty-seven million, nine hundred forty thousand, seven hundred twenty-eight".