858642872 has 24 divisors (see below), whose sum is σ = 1617580200. Its totient is φ = 427297584.

The previous prime is 858642853. The next prime is 858642881. The reversal of 858642872 is 278246858.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 858642872.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 456029 + ... + 457907.

It is an arithmetic number, because the mean of its divisors is an integer number (67399175).

Almost surely, 2^858642872 is an apocalyptic number.

It is an amenable number.

858642872 is a deficient number, since it is larger than the sum of its proper divisors (758937328).

858642872 is a wasteful number, since it uses less digits than its factorization.

858642872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2363 (or 2120 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 50.

The square root of 858642872 is about 29302.6086210767. The cubic root of 858642872 is about 950.4680508009.

It can be divided in two parts, 8586428 and 72, that multiplied together give a palindrome (618222816).

The spelling of 858642872 in words is "eight hundred fifty-eight million, six hundred forty-two thousand, eight hundred seventy-two".