67640306 has 16 divisors (see below), whose sum is σ = 103491648. Its totient is φ = 33150000.

The previous prime is 67640303. The next prime is 67640347. The reversal of 67640306 is 60304676.

It is not an unprimeable number, because it can be changed into a prime (67640303) 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, 19181 + ... + 22431.

It is an arithmetic number, because the mean of its divisors is an integer number (6468228).

Almost surely, 2^67640306 is an apocalyptic number.

67640306 is a deficient number, since it is larger than the sum of its proper divisors (35851342).

67640306 is a wasteful number, since it uses less digits than its factorization.

67640306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3457.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 67640306 is about 8224.3726812444. The cubic root of 67640306 is about 407.4445576773. Note that the first 3 decimals are identical.

The spelling of 67640306 in words is "sixty-seven million, six hundred forty thousand, three hundred six".