67856641 has 8 divisors (see below), whose sum is σ = 68866560. Its totient is φ = 66853248.

The previous prime is 67856629. The next prime is 67856653. The reversal of 67856641 is 14665876.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67856629) and next prime (67856653).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 67856641 - 2²³ = 59468033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67856611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21720 + ... + 24646.

It is an arithmetic number, because the mean of its divisors is an integer number (8608320).

Almost surely, 2^67856641 is an apocalyptic number.

It is an amenable number.

67856641 is a deficient number, since it is larger than the sum of its proper divisors (1009919).

67856641 is a wasteful number, since it uses less digits than its factorization.

67856641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3263.

The product of its digits is 241920, while the sum is 43.

The square root of 67856641 is about 8237.5142488496. The cubic root of 67856641 is about 407.8784740747.

The spelling of 67856641 in words is "sixty-seven million, eight hundred fifty-six thousand, six hundred forty-one".