857857660 has 24 divisors (see below), whose sum is σ = 1965274416. Its totient is φ = 311948160.

The previous prime is 857857607. The next prime is 857857661. The reversal of 857857660 is 66758758.

It is a junction number, because it is equal to n+sod(n) for n = 857857598 and 857857607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857857661) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1949457 + ... + 1949896.

It is an arithmetic number, because the mean of its divisors is an integer number (81886434).

Almost surely, 2^857857660 is an apocalyptic number.

It is an amenable number.

857857660 is an abundant number, since it is smaller than the sum of its proper divisors (1107416756).

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

857857660 is a wasteful number, since it uses less digits than its factorization.

857857660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3899373 (or 3899371 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 52.

The square root of 857857660 is about 29289.2072272365. The cubic root of 857857660 is about 950.1782343332.

The spelling of 857857660 in words is "eight hundred fifty-seven million, eight hundred fifty-seven thousand, six hundred sixty".