864143505 has 32 divisors (see below), whose sum is σ = 1540022400. Its totient is φ = 459746496.

The previous prime is 864143471. The next prime is 864143513. The reversal of 864143505 is 505341468.

It is a happy number.

864143505 is a `hidden beast` number, since 8 + 6 + 4 + 143 + 505 = 666.

It is not a de Polignac number, because 864143505 - 2⁷ = 864143377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864143505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48927 + ... + 64203.

It is an arithmetic number, because the mean of its divisors is an integer number (48125700).

Almost surely, 2^864143505 is an apocalyptic number.

It is an amenable number.

864143505 is a deficient number, since it is larger than the sum of its proper divisors (675878895).

864143505 is a wasteful number, since it uses less digits than its factorization.

864143505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15710 (or 15704 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 864143505 is about 29396.3178816667. The cubic root of 864143505 is about 952.4933597404.

The spelling of 864143505 in words is "eight hundred sixty-four million, one hundred forty-three thousand, five hundred five".