68523989 has 4 divisors (see below), whose sum is σ = 68540556. Its totient is φ = 68507424.

The previous prime is 68523971. The next prime is 68524003. The reversal of 68523989 is 98932586.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98932586 = 2 ⋅49466293.

It can be written as a sum of positive squares in 2 ways, for example, as 13140625 + 55383364 = 3625^2 + 7442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68523989 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 (68523589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707 + ... + 12279.

It is an arithmetic number, because the mean of its divisors is an integer number (17135139).

Almost surely, 2^68523989 is an apocalyptic number.

It is an amenable number.

68523989 is a deficient number, since it is larger than the sum of its proper divisors (16567).

68523989 is an equidigital number, since it uses as much as digits as its factorization.

68523989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16566.

The product of its digits is 933120, while the sum is 50.

The square root of 68523989 is about 8277.9217802538. The cubic root of 68523989 is about 409.2112318856.

The spelling of 68523989 in words is "sixty-eight million, five hundred twenty-three thousand, nine hundred eighty-nine".