864641140 has 48 divisors (see below), whose sum is σ = 2022983424. Its totient is φ = 307721600.

The previous prime is 864641137. The next prime is 864641171. The reversal of 864641140 is 41146468.

It is a junction number, because it is equal to n+sod(n) for n = 864641096 and 864641105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31471 + ... + 52150.

It is an arithmetic number, because the mean of its divisors is an integer number (42145488).

Almost surely, 2^864641140 is an apocalyptic number.

It is an amenable number.

864641140 is an abundant number, since it is smaller than the sum of its proper divisors (1158342284).

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

864641140 is a wasteful number, since it uses less digits than its factorization.

864641140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83688 (or 83686 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 864641140 is about 29404.7809037918. The cubic root of 864641140 is about 952.6761623548.

The spelling of 864641140 in words is "eight hundred sixty-four million, six hundred forty-one thousand, one hundred forty".