864552840 has 128 divisors (see below), whose sum is σ = 2676326400. Its totient is φ = 223292160.

The previous prime is 864552823. The next prime is 864552847. The reversal of 864552840 is 48255468.

It is a super-2 number, since 2×864552840² = 1494903226304131200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 864552792 and 864552801.

It is not an unprimeable number, because it can be changed into a prime (864552847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 675321 + ... + 676599.

It is an arithmetic number, because the mean of its divisors is an integer number (20908800).

Almost surely, 2^864552840 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 864552840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1338163200).

864552840 is an abundant number, since it is smaller than the sum of its proper divisors (1811773560).

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

864552840 is a wasteful number, since it uses less digits than its factorization.

864552840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1467 (or 1463 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The square root of 864552840 is about 29403.2794089367. The cubic root of 864552840 is about 952.6437311087.

The spelling of 864552840 in words is "eight hundred sixty-four million, five hundred fifty-two thousand, eight hundred forty".