67856544 has 144 divisors (see below), whose sum is σ = 223449408. Its totient is φ = 19132416.

The previous prime is 67856521. The next prime is 67856561. The reversal of 67856544 is 44565876.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 67856544.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 195379 + ... + 195725.

It is an arithmetic number, because the mean of its divisors is an integer number (1551732).

Almost surely, 2^67856544 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 67856544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111724704).

67856544 is an abundant number, since it is smaller than the sum of its proper divisors (155592864).

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

67856544 is a wasteful number, since it uses less digits than its factorization.

67856544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 456 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The square root of 67856544 is about 8237.5083611490. The cubic root of 67856544 is about 407.8782797226.

The spelling of 67856544 in words is "sixty-seven million, eight hundred fifty-six thousand, five hundred forty-four".