68165664 has 144 divisors (see below), whose sum is σ = 213621408. Its totient is φ = 18966528.

The previous prime is 68165653. The next prime is 68165681. The reversal of 68165664 is 46656186.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 202104 + ... + 202440.

It is an arithmetic number, because the mean of its divisors is an integer number (1483482).

Almost surely, 2^68165664 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 68165664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106810704).

68165664 is an abundant number, since it is smaller than the sum of its proper divisors (145455744).

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

68165664 is a wasteful number, since it uses less digits than its factorization.

68165664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 392 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 68165664 is about 8256.2499962150. The cubic root of 68165664 is about 408.4967037892.

The spelling of 68165664 in words is "sixty-eight million, one hundred sixty-five thousand, six hundred sixty-four".