864647982 has 48 divisors (see below), whose sum is σ = 2163940272. Its totient is φ = 246600960.

The previous prime is 864647929. The next prime is 864647983. The reversal of 864647982 is 289746468.

It is a super-2 number, since 2×864647982² = 1495232265553344648, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864647983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125073 + ... + 131804.

It is an arithmetic number, because the mean of its divisors is an integer number (45082089).

Almost surely, 2^864647982 is an apocalyptic number.

864647982 is an abundant number, since it is smaller than the sum of its proper divisors (1299292290).

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

864647982 is a wasteful number, since it uses less digits than its factorization.

864647982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256913 (or 256910 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 864647982 is about 29404.8972451869. The cubic root of 864647982 is about 952.6786752251.

It can be divided in two parts, 8646479 and 82, that added together give a triangular number (8646561 = T₄₁₅₈).

The spelling of 864647982 in words is "eight hundred sixty-four million, six hundred forty-seven thousand, nine hundred eighty-two".