68424320 has 128 divisors (see below), whose sum is σ = 182865600. Its totient is φ = 24330240.

The previous prime is 68424319. The next prime is 68424329. The reversal of 68424320 is 2342486.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (68424329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206555 + ... + 206885.

Almost surely, 2^68424320 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 68424320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91432800).

68424320 is an abundant number, since it is smaller than the sum of its proper divisors (114441280).

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

68424320 is a wasteful number, since it uses less digits than its factorization.

68424320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 68424320 is about 8271.8994191177. The cubic root of 68424320 is about 409.0127346621.

The spelling of 68424320 in words is "sixty-eight million, four hundred twenty-four thousand, three hundred twenty".