67381812 has 72 divisors (see below), whose sum is σ = 188225856. Its totient is φ = 20216064.

The previous prime is 67381801. The next prime is 67381813. The reversal of 67381812 is 21818376.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67381813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11683 + ... + 16469.

It is an arithmetic number, because the mean of its divisors is an integer number (2614248).

Almost surely, 2^67381812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67381812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94112928).

67381812 is an abundant number, since it is smaller than the sum of its proper divisors (120844044).

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

67381812 is a wasteful number, since it uses less digits than its factorization.

67381812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4837 (or 4832 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 67381812 is about 8208.6425187116. The cubic root of 67381812 is about 406.9248654437.

The spelling of 67381812 in words is "sixty-seven million, three hundred eighty-one thousand, eight hundred twelve".