857852820 has 72 divisors (see below), whose sum is σ = 2838719520. Its totient is φ = 207963840.

The previous prime is 857852813. The next prime is 857852833. The reversal of 857852820 is 28258758.

857852820 is a `hidden beast` number, since 8 + 578 + 52 + 8 + 20 = 666.

It is a super-2 number, since 2×857852820² = 1471822921563904800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 214650 + ... + 218609.

It is an arithmetic number, because the mean of its divisors is an integer number (39426660).

Almost surely, 2^857852820 is an apocalyptic number.

It is an amenable number.

857852820 is an abundant number, since it is smaller than the sum of its proper divisors (1980866700).

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

857852820 is a wasteful number, since it uses less digits than its factorization.

857852820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433285 (or 433280 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 857852820 is about 29289.1246028283. The cubic root of 857852820 is about 950.1764473734.

The spelling of 857852820 in words is "eight hundred fifty-seven million, eight hundred fifty-two thousand, eight hundred twenty".