67981284 has 144 divisors (see below), whose sum is σ = 211131648. Its totient is φ = 18019584.

The previous prime is 67981253. The next prime is 67981313. The reversal of 67981284 is 48218976.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 214294 + ... + 214610.

It is an arithmetic number, because the mean of its divisors is an integer number (1466192).

Almost surely, 2^67981284 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 67981284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105565824).

67981284 is an abundant number, since it is smaller than the sum of its proper divisors (143150364).

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

67981284 is a wasteful number, since it uses less digits than its factorization.

67981284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 389 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 67981284 is about 8245.0763489491. The cubic root of 67981284 is about 408.1280595709.

It can be divided in two parts, 67981 and 284, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 67981284 in words is "sixty-seven million, nine hundred eighty-one thousand, two hundred eighty-four".