68642321 has 4 divisors (see below), whose sum is σ = 74882544. Its totient is φ = 62402100.

The previous prime is 68642317. The next prime is 68642369. The reversal of 68642321 is 12324686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68642321 - 2² = 68642317 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68642381) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3120095 + ... + 3120116.

It is an arithmetic number, because the mean of its divisors is an integer number (18720636).

Almost surely, 2^68642321 is an apocalyptic number.

It is an amenable number.

68642321 is a deficient number, since it is larger than the sum of its proper divisors (6240223).

68642321 is a wasteful number, since it uses less digits than its factorization.

68642321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6240222.

The product of its digits is 13824, while the sum is 32.

The square root of 68642321 is about 8285.0661433690. The cubic root of 68642321 is about 409.4466479184.

The spelling of 68642321 in words is "sixty-eight million, six hundred forty-two thousand, three hundred twenty-one".