51870856 has 8 divisors (see below), whose sum is σ = 97257870. Its totient is φ = 25935424.

The previous prime is 51870809. The next prime is 51870877. The reversal of 51870856 is 65807815.

51870856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50268100 + 1602756 = 7090^2 + 1266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 3241921 + ... + 3241936.

Almost surely, 2^51870856 is an apocalyptic number.

It is an amenable number.

51870856 is a deficient number, since it is larger than the sum of its proper divisors (45387014).

51870856 is a wasteful number, since it uses less digits than its factorization.

51870856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6483863 (or 6483859 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 51870856 is about 7202.1424590187. The cubic root of 51870856 is about 372.9418650278.

The spelling of 51870856 in words is "fifty-one million, eight hundred seventy thousand, eight hundred fifty-six".