866989305 has 64 divisors (see below), whose sum is σ = 1897029120. Its totient is φ = 365845248.

The previous prime is 866989303. The next prime is 866989337. The reversal of 866989305 is 503989668.

It is not a de Polignac number, because 866989305 - 2¹ = 866989303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866989303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23002 + ... + 47571.

It is an arithmetic number, because the mean of its divisors is an integer number (29641080).

Almost surely, 2^866989305 is an apocalyptic number.

It is an amenable number.

866989305 is an abundant number, since it is smaller than the sum of its proper divisors (1030039815).

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

866989305 is a wasteful number, since it uses less digits than its factorization.

866989305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70607 (or 70601 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 866989305 is about 29444.6821174894. The cubic root of 866989305 is about 953.5377987310.

The spelling of 866989305 in words is "eight hundred sixty-six million, nine hundred eighty-nine thousand, three hundred five".