866818998 has 24 divisors (see below), whose sum is σ = 1879956000. Its totient is φ = 288655344.

The previous prime is 866818991. The next prime is 866819003. The reversal of 866818998 is 899818668.

866818998 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866818991) 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, 4473 + ... + 41876.

It is an arithmetic number, because the mean of its divisors is an integer number (78331500).

Almost surely, 2^866818998 is an apocalyptic number.

866818998 is an abundant number, since it is smaller than the sum of its proper divisors (1013137002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866818998 is a wasteful number, since it uses less digits than its factorization.

866818998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47396 (or 47393 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The square root of 866818998 is about 29441.7899931373. The cubic root of 866818998 is about 953.4753585927.

The spelling of 866818998 in words is "eight hundred sixty-six million, eight hundred eighteen thousand, nine hundred ninety-eight".