68637989 has 8 divisors (see below), whose sum is σ = 78504960. Its totient is φ = 58786416.

The previous prime is 68637979. The next prime is 68638007. The reversal of 68637989 is 98973686.

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

It is a cyclic number.

It is not a de Polignac number, because 68637989 - 2⁴ = 68637973 is a prime.

It is a super-2 number, since 2×68637989² = 9422347067928242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68637979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8252 + ... + 14330.

It is an arithmetic number, because the mean of its divisors is an integer number (9813120).

Almost surely, 2^68637989 is an apocalyptic number.

It is an amenable number.

68637989 is a deficient number, since it is larger than the sum of its proper divisors (9866971).

68637989 is a wasteful number, since it uses less digits than its factorization.

68637989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699.

The product of its digits is 3919104, while the sum is 56.

The square root of 68637989 is about 8284.8047050006. The cubic root of 68637989 is about 409.4380343781.

The spelling of 68637989 in words is "sixty-eight million, six hundred thirty-seven thousand, nine hundred eighty-nine".