68309712 has 60 divisors (see below), whose sum is σ = 201242080. Its totient is φ = 21570624.

The previous prime is 68309699. The next prime is 68309713. The reversal of 68309712 is 21790386.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68309713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9748 + ... + 15219.

Almost surely, 2^68309712 is an apocalyptic number.

It is an amenable number.

68309712 is an abundant number, since it is smaller than the sum of its proper divisors (132932368).

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

68309712 is a wasteful number, since it uses less digits than its factorization.

68309712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25000 (or 24991 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 68309712 is about 8264.9689654590. The cubic root of 68309712 is about 408.7842470534.

The spelling of 68309712 in words is "sixty-eight million, three hundred nine thousand, seven hundred twelve".