68890321 has 4 divisors (see below), whose sum is σ = 68936512. Its totient is φ = 68844132.

The previous prime is 68890279. The next prime is 68890331. The reversal of 68890321 is 12309886.

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 68890321 - 2¹³ = 68882129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68890331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20781 + ... + 23866.

It is an arithmetic number, because the mean of its divisors is an integer number (17234128).

Almost surely, 2^68890321 is an apocalyptic number.

It is an amenable number.

68890321 is a deficient number, since it is larger than the sum of its proper divisors (46191).

68890321 is a wasteful number, since it uses less digits than its factorization.

68890321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46190.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 68890321 is about 8300.0193373269. The cubic root of 68890321 is about 409.9391561507.

The spelling of 68890321 in words is "sixty-eight million, eight hundred ninety thousand, three hundred twenty-one".