857899872 has 36 divisors (see below), whose sum is σ = 2439653580. Its totient is φ = 285966528.

The previous prime is 857899853. The next prime is 857899873. The reversal of 857899872 is 278998758.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857899873) 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 5 ways as a sum of consecutive naturals, for example, 1489122 + ... + 1489697.

It is an arithmetic number, because the mean of its divisors is an integer number (67768155).

Almost surely, 2^857899872 is an apocalyptic number.

It is an amenable number.

857899872 is an abundant number, since it is smaller than the sum of its proper divisors (1581753708).

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

857899872 is a wasteful number, since it uses less digits than its factorization.

857899872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978835 (or 2978824 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The square root of 857899872 is about 29289.9278251074. The cubic root of 857899872 is about 950.1938189954.

The spelling of 857899872 in words is "eight hundred fifty-seven million, eight hundred ninety-nine thousand, eight hundred seventy-two".