68287321 has 8 divisors (see below), whose sum is σ = 69229160. Its totient is φ = 67350528.

The previous prime is 68287313. The next prime is 68287333. The reversal of 68287321 is 12378286.

It can be written as a sum of positive squares in 4 ways, for example, as 13690000 + 54597321 = 3700^2 + 7389^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68287321 - 2³ = 68287313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68287421) 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, 31645 + ... + 33733.

It is an arithmetic number, because the mean of its divisors is an integer number (8653645).

Almost surely, 2^68287321 is an apocalyptic number.

It is an amenable number.

68287321 is a deficient number, since it is larger than the sum of its proper divisors (941839).

68287321 is a wasteful number, since it uses less digits than its factorization.

68287321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523.

The product of its digits is 32256, while the sum is 37.

The square root of 68287321 is about 8263.6142818987. The cubic root of 68287321 is about 408.7395775226.

The spelling of 68287321 in words is "sixty-eight million, two hundred eighty-seven thousand, three hundred twenty-one".