67663616 has 36 divisors (see below), whose sum is σ = 137638872. Its totient is φ = 33186816.

The previous prime is 67663613. The next prime is 67663633. The reversal of 67663616 is 61636676.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67663613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11075 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (3823302).

Almost surely, 2^67663616 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 67663616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68819436).

67663616 is an abundant number, since it is smaller than the sum of its proper divisors (69975256).

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

67663616 is an equidigital number, since it uses as much as digits as its factorization.

67663616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5056 (or 5042 counting only the distinct ones).

The product of its digits is 163296, while the sum is 41.

The square root of 67663616 is about 8225.7896885345. The cubic root of 67663616 is about 407.4913564102.

The spelling of 67663616 in words is "sixty-seven million, six hundred sixty-three thousand, six hundred sixteen".