68128889 has 8 divisors (see below), whose sum is σ = 72624000. Its totient is φ = 63724752.

The previous prime is 68128871. The next prime is 68128891. The reversal of 68128889 is 98882186.

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 68128889 - 2¹⁶ = 68063353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68128289) 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, 21194 + ... + 24195.

It is an arithmetic number, because the mean of its divisors is an integer number (9078000).

Almost surely, 2^68128889 is an apocalyptic number.

It is an amenable number.

68128889 is a deficient number, since it is larger than the sum of its proper divisors (4495111).

68128889 is a wasteful number, since it uses less digits than its factorization.

68128889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45487.

The product of its digits is 442368, while the sum is 50.

The square root of 68128889 is about 8254.0225950745. The cubic root of 68128889 is about 408.4232300014.

The spelling of 68128889 in words is "sixty-eight million, one hundred twenty-eight thousand, eight hundred eighty-nine".