866880989 has 8 divisors (see below), whose sum is σ = 955275552. Its totient is φ = 781588080.

The previous prime is 866880901. The next prime is 866880991. The reversal of 866880989 is 989088668.

It is a happy number.

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

It is not a de Polignac number, because 866880989 - 2²⁴ = 850103773 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 (866850989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774827 + ... + 775944.

It is an arithmetic number, because the mean of its divisors is an integer number (119409444).

Almost surely, 2^866880989 is an apocalyptic number.

It is an amenable number.

866880989 is a deficient number, since it is larger than the sum of its proper divisors (88394563).

866880989 is a wasteful number, since it uses less digits than its factorization.

866880989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550827.

The product of its (nonzero) digits is 11943936, while the sum is 62.

The square root of 866880989 is about 29442.8427465827. The cubic root of 866880989 is about 953.4980874754.

The spelling of 866880989 in words is "eight hundred sixty-six million, eight hundred eighty thousand, nine hundred eighty-nine".