68817321 has 6 divisors (see below), whose sum is σ = 99402810. Its totient is φ = 45878208.

The previous prime is 68817317. The next prime is 68817323. The reversal of 68817321 is 12371886.

It can be written as a sum of positive squares in only one way, i.e., 57927321 + 10890000 = 7611^2 + 3300^2 .

It is not a de Polignac number, because 68817321 - 2² = 68817317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68817323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3823176 + ... + 3823193.

It is an arithmetic number, because the mean of its divisors is an integer number (16567135).

Almost surely, 2^68817321 is an apocalyptic number.

It is an amenable number.

68817321 is a deficient number, since it is larger than the sum of its proper divisors (30585489).

68817321 is a wasteful number, since it uses less digits than its factorization.

68817321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7646375 (or 7646372 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 68817321 is about 8295.6205916134. The cubic root of 68817321 is about 409.7943068964.

The spelling of 68817321 in words is "sixty-eight million, eight hundred seventeen thousand, three hundred twenty-one".