68639360 has 64 divisors (see below), whose sum is σ = 171262080. Its totient is φ = 26256384.

The previous prime is 68639327. The next prime is 68639369. The reversal of 68639360 is 6393686.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×68639360² = 9422723482419200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68639369) 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, 12389 + ... + 17051.

It is an arithmetic number, because the mean of its divisors is an integer number (2675970).

Almost surely, 2^68639360 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 68639360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85631040).

68639360 is an abundant number, since it is smaller than the sum of its proper divisors (102622720).

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

68639360 is a wasteful number, since it uses less digits than its factorization.

68639360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4705 (or 4693 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 68639360 is about 8284.8874464292. The cubic root of 68639360 is about 409.4407604477.

The spelling of 68639360 in words is "sixty-eight million, six hundred thirty-nine thousand, three hundred sixty".