857143728 has 80 divisors (see below), whose sum is σ = 2811804160. Its totient is φ = 244897344.

The previous prime is 857143717. The next prime is 857143753. The reversal of 857143728 is 827341758.

857143728 is a `hidden beast` number, since 8 + 571 + 4 + 3 + 72 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138700 + ... + 144747.

It is an arithmetic number, because the mean of its divisors is an integer number (35147552).

Almost surely, 2^857143728 is an apocalyptic number.

It is an amenable number.

857143728 is an abundant number, since it is smaller than the sum of its proper divisors (1954660432).

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

857143728 is a wasteful number, since it uses less digits than its factorization.

857143728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283471 (or 283459 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 857143728 is about 29277.0170611693. The cubic root of 857143728 is about 949.9145732972.

The spelling of 857143728 in words is "eight hundred fifty-seven million, one hundred forty-three thousand, seven hundred twenty-eight".