68219989 has 4 divisors (see below), whose sum is σ = 69376320. Its totient is φ = 67063660.

The previous prime is 68219981. The next prime is 68219993. The reversal of 68219989 is 98991286.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98991286 = 2 ⋅49495643.

It is a cyclic number.

It is not a de Polignac number, because 68219989 - 2³ = 68219981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68219981) 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, 578077 + ... + 578194.

It is an arithmetic number, because the mean of its divisors is an integer number (17344080).

Almost surely, 2^68219989 is an apocalyptic number.

It is an amenable number.

68219989 is a deficient number, since it is larger than the sum of its proper divisors (1156331).

68219989 is a wasteful number, since it uses less digits than its factorization.

68219989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156330.

The product of its digits is 559872, while the sum is 52.

The square root of 68219989 is about 8259.5392728650. The cubic root of 68219989 is about 408.6051928706.

The spelling of 68219989 in words is "sixty-eight million, two hundred nineteen thousand, nine hundred eighty-nine".