857056785 has 32 divisors (see below), whose sum is σ = 1563649920. Its totient is φ = 397114368.

The previous prime is 857056763. The next prime is 857056787. The reversal of 857056785 is 587650758.

It is a de Polignac number, because none of the positive numbers 2^k-857056785 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (857056787) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 125955 + ... + 132584.

It is an arithmetic number, because the mean of its divisors is an integer number (48864060).

Almost surely, 2^857056785 is an apocalyptic number.

857056785 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

857056785 is a deficient number, since it is larger than the sum of its proper divisors (706593135).

857056785 is a wasteful number, since it uses less digits than its factorization.

857056785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258577.

The product of its (nonzero) digits is 2352000, while the sum is 51.

The square root of 857056785 is about 29275.5321898680. The cubic root of 857056785 is about 949.8824545239.

The spelling of 857056785 in words is "eight hundred fifty-seven million, fifty-six thousand, seven hundred eighty-five".