68215730 has 32 divisors (see below), whose sum is σ = 141834240. Its totient is φ = 23345920.

The previous prime is 68215729. The next prime is 68215783. The reversal of 68215730 is 3751286.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16370 + ... + 20109.

It is an arithmetic number, because the mean of its divisors is an integer number (4432320).

Almost surely, 2^68215730 is an apocalyptic number.

68215730 is an abundant number, since it is smaller than the sum of its proper divisors (73618510).

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

68215730 is a wasteful number, since it uses less digits than its factorization.

68215730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36514.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 68215730 is about 8259.2814457433. The cubic root of 68215730 is about 408.5966895675.

The spelling of 68215730 in words is "sixty-eight million, two hundred fifteen thousand, seven hundred thirty".