68651989 has 12 divisors (see below), whose sum is σ = 80028000. Its totient is φ = 58721208.

The previous prime is 68651981. The next prime is 68652029. The reversal of 68651989 is 98915686.

It is not a de Polignac number, because 68651989 - 2³ = 68651981 is a prime.

It is a super-2 number, since 2×68651989² = 9426191187312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68651981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28182 + ... + 30520.

It is an arithmetic number, because the mean of its divisors is an integer number (6669000).

Almost surely, 2^68651989 is an apocalyptic number.

It is an amenable number.

68651989 is a deficient number, since it is larger than the sum of its proper divisors (11376011).

68651989 is a wasteful number, since it uses less digits than its factorization.

68651989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952 (or 2945 counting only the distinct ones).

The product of its digits is 933120, while the sum is 52.

The square root of 68651989 is about 8285.6495822597. The cubic root of 68651989 is about 409.4658699974.

The spelling of 68651989 in words is "sixty-eight million, six hundred fifty-one thousand, nine hundred eighty-nine".