68281989 has 8 divisors (see below), whose sum is σ = 91111680. Its totient is φ = 45486816.

The previous prime is 68281981. The next prime is 68281999. The reversal of 68281989 is 98918286.

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

It is not a de Polignac number, because 68281989 - 2³ = 68281981 is a prime.

It is a super-2 number, since 2×68281989² = 9324860043592242, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68281981) 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 7 ways as a sum of consecutive naturals, for example, 3592 + ... + 12225.

It is an arithmetic number, because the mean of its divisors is an integer number (11388960).

Almost surely, 2^68281989 is an apocalyptic number.

It is an amenable number.

68281989 is a deficient number, since it is larger than the sum of its proper divisors (22829691).

68281989 is a wasteful number, since it uses less digits than its factorization.

68281989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17259.

The product of its digits is 497664, while the sum is 51.

The square root of 68281989 is about 8263.2916564769. The cubic root of 68281989 is about 408.7289388656.

The spelling of 68281989 in words is "sixty-eight million, two hundred eighty-one thousand, nine hundred eighty-nine".