67281393444 has 24 divisors (see below), whose sum is σ = 157312292928. Its totient is φ = 22381077600.

The previous prime is 67281393427. The next prime is 67281393451. The reversal of 67281393444 is 44439318276.

It is a happy number.

It is a super-2 number, since 2×67281393444² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5750607 + ... + 5762294.

It is an arithmetic number, because the mean of its divisors is an integer number (6554678872).

Almost surely, 2^67281393444 is an apocalyptic number.

It is an amenable number.

67281393444 is an abundant number, since it is smaller than the sum of its proper divisors (90030899484).

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

67281393444 is a wasteful number, since it uses less digits than its factorization.

67281393444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11513395 (or 11513393 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 51.

The spelling of 67281393444 in words is "sixty-seven billion, two hundred eighty-one million, three hundred ninety-three thousand, four hundred forty-four".