70857 has 6 divisors (see below), whose sum is σ = 102362. Its totient is φ = 47232.

The previous prime is 70853. The next prime is 70867. The reversal of 70857 is 75807.

It can be written as a sum of positive squares in only one way, i.e., 41616 + 29241 = 204^2 + 171^2 .

It is not a de Polignac number, because 70857 - 2² = 70853 is a prime.

It is a Duffinian number.

70857 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 70857.

It is not an unprimeable number, because it can be changed into a prime (70853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3928 + ... + 3945.

2⁷⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

70857 is a deficient number, since it is larger than the sum of its proper divisors (31505).

70857 is a wasteful number, since it uses less digits than its factorization.

70857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7879 (or 7876 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 70857 is about 266.1897819226. The cubic root of 70857 is about 41.3803589533.

Subtracting 70857 from its reverse (75807), we obtain a triangular number (4950 = T₉₉).

The spelling of 70857 in words is "seventy thousand, eight hundred fifty-seven".