857293728723 has 6 divisors (see below), whose sum is σ = 1238313163724. Its totient is φ = 571529152476.

The previous prime is 857293728721. The next prime is 857293728743. The reversal of 857293728723 is 327827392758.

857293728723 is a `hidden beast` number, since 8 + 572 + 9 + 37 + 2 + 8 + 7 + 23 = 666.

It is not a de Polignac number, because 857293728723 - 2¹ = 857293728721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (857293728721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47627429365 + ... + 47627429382.

Almost surely, 2^857293728723 is an apocalyptic number.

857293728723 is a deficient number, since it is larger than the sum of its proper divisors (381019435001).

857293728723 is a wasteful number, since it uses less digits than its factorization.

857293728723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95254858753 (or 95254858750 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 63.

The spelling of 857293728723 in words is "eight hundred fifty-seven billion, two hundred ninety-three million, seven hundred twenty-eight thousand, seven hundred twenty-three".