860172857 has 8 divisors (see below), whose sum is σ = 893660040. Its totient is φ = 826940800.

The previous prime is 860172847. The next prime is 860172869. The reversal of 860172857 is 758271068.

It can be written as a sum of positive squares in 4 ways, for example, as 41011216 + 819161641 = 6404^2 + 28621^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 860172857 - 2⁶ = 860172793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (860172827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56894 + ... + 70407.

It is an arithmetic number, because the mean of its divisors is an integer number (111707505).

Almost surely, 2^860172857 is an apocalyptic number.

It is an amenable number.

860172857 is a deficient number, since it is larger than the sum of its proper divisors (33487183).

860172857 is a wasteful number, since it uses less digits than its factorization.

860172857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127563.

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 860172857 is about 29328.7036365401. The cubic root of 860172857 is about 951.0322508240.

The spelling of 860172857 in words is "eight hundred sixty million, one hundred seventy-two thousand, eight hundred fifty-seven".