68051664 has 120 divisors (see below), whose sum is σ = 206361792. Its totient is φ = 21669120.

The previous prime is 68051657. The next prime is 68051713. The reversal of 68051664 is 46615086.

68051664 is a `hidden beast` number, since 6 + 80 + 516 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 89044 + ... + 89804.

Almost surely, 2^68051664 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 68051664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103180896).

68051664 is an abundant number, since it is smaller than the sum of its proper divisors (138310128).

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

68051664 is a wasteful number, since it uses less digits than its factorization.

68051664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 68051664 is about 8249.3432465864. The cubic root of 68051664 is about 408.2688539401.

The spelling of 68051664 in words is "sixty-eight million, fifty-one thousand, six hundred sixty-four".