866947984 has 60 divisors (see below), whose sum is σ = 2017037568. Its totient is φ = 359553600.

The previous prime is 866947981. The next prime is 866947987. The reversal of 866947984 is 489749668.

It is an interprime number because it is at equal distance from previous prime (866947981) and next prime (866947987).

It is not an unprimeable number, because it can be changed into a prime (866947981) 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, 6469 + ... + 42139.

Almost surely, 2^866947984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866947984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008518784).

866947984 is an abundant number, since it is smaller than the sum of its proper divisors (1150089584).

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

866947984 is a wasteful number, since it uses less digits than its factorization.

866947984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35724 (or 35711 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 61.

The square root of 866947984 is about 29443.9804374341. The cubic root of 866947984 is about 953.5226498470.

The spelling of 866947984 in words is "eight hundred sixty-six million, nine hundred forty-seven thousand, nine hundred eighty-four".