68609989 has 16 divisors (see below), whose sum is σ = 83570688. Its totient is φ = 55048752.

The previous prime is 68609953. The next prime is 68610001. The reversal of 68609989 is 98990686.

It is not a de Polignac number, because 68609989 - 2¹¹ = 68607941 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 (68609929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3034 + ... + 12100.

It is an arithmetic number, because the mean of its divisors is an integer number (5223168).

Almost surely, 2^68609989 is an apocalyptic number.

It is an amenable number.

68609989 is a deficient number, since it is larger than the sum of its proper divisors (14960699).

68609989 is a wasteful number, since it uses less digits than its factorization.

68609989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9144.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 68609989 is about 8283.1146919501. The cubic root of 68609989 is about 409.3823517822.

The spelling of 68609989 in words is "sixty-eight million, six hundred nine thousand, nine hundred eighty-nine".