857809055 has 16 divisors (see below), whose sum is σ = 1084907520. Its totient is φ = 649313568.

The previous prime is 857809033. The next prime is 857809061. The reversal of 857809055 is 550908758.

It is a cyclic number.

It is not a de Polignac number, because 857809055 - 2⁸ = 857808799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76754 + ... + 87216.

It is an arithmetic number, because the mean of its divisors is an integer number (67806720).

Almost surely, 2^857809055 is an apocalyptic number.

857809055 is a deficient number, since it is larger than the sum of its proper divisors (227098465).

857809055 is a wasteful number, since it uses less digits than its factorization.

857809055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11350.

The product of its (nonzero) digits is 504000, while the sum is 47.

The square root of 857809055 is about 29288.3774729841. The cubic root of 857809055 is about 950.1602887432.

The spelling of 857809055 in words is "eight hundred fifty-seven million, eight hundred nine thousand, fifty-five".