857790755 has 4 divisors (see below), whose sum is σ = 1029348912. Its totient is φ = 686232600.

The previous prime is 857790673. The next prime is 857790763. The reversal of 857790755 is 557097758.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 857790755 - 2²⁶ = 790681891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857790697 and 857790706.

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 3 ways as a sum of consecutive naturals, for example, 85779071 + ... + 85779080.

It is an arithmetic number, because the mean of its divisors is an integer number (257337228).

Almost surely, 2^857790755 is an apocalyptic number.

857790755 is a deficient number, since it is larger than the sum of its proper divisors (171558157).

857790755 is a wasteful number, since it uses less digits than its factorization.

857790755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171558156.

The product of its (nonzero) digits is 3087000, while the sum is 53.

The square root of 857790755 is about 29288.0650607035. The cubic root of 857790755 is about 950.1535319727.

The spelling of 857790755 in words is "eight hundred fifty-seven million, seven hundred ninety thousand, seven hundred fifty-five".