68551664 has 20 divisors (see below), whose sum is σ = 137104320. Its totient is φ = 33169920.

The previous prime is 68551657. The next prime is 68551669. The reversal of 68551664 is 46615586.

It is a happy number.

68551664 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68551669) 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, 68609 + ... + 69600.

It is an arithmetic number, because the mean of its divisors is an integer number (6855216).

Almost surely, 2^68551664 is an apocalyptic number.

It is an amenable number.

68551664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

68551664 is a wasteful number, since it uses less digits than its factorization.

68551664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138248 (or 138242 counting only the distinct ones).

The product of its digits is 172800, while the sum is 41.

The square root of 68551664 is about 8279.5932267232. The cubic root of 68551664 is about 409.2663142820.

The spelling of 68551664 in words is "sixty-eight million, five hundred fifty-one thousand, six hundred sixty-four".