67640412 has 48 divisors (see below), whose sum is σ = 186600960. Its totient is φ = 18658752.

The previous prime is 67640411. The next prime is 67640423. The reversal of 67640412 is 21404676.

It is a self number, because there is not a number n which added to its sum of digits gives 67640412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67640411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11448 + ... + 16319.

It is an arithmetic number, because the mean of its divisors is an integer number (3887520).

Almost surely, 2^67640412 is an apocalyptic number.

It is an amenable number.

67640412 is an abundant number, since it is smaller than the sum of its proper divisors (118960548).

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

67640412 is a wasteful number, since it uses less digits than its factorization.

67640412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27810 (or 27808 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 67640412 is about 8224.3791255024. The cubic root of 67640412 is about 407.4447705144. Note that the first 3 decimals are identical.

The spelling of 67640412 in words is "sixty-seven million, six hundred forty thousand, four hundred twelve".