51866385 has 32 divisors (see below), whose sum is σ = 85895040. Its totient is φ = 26707968.

The previous prime is 51866377. The next prime is 51866387. The reversal of 51866385 is 58366815.

51866385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51866385 - 2³ = 51866377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51866387) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 62151 + ... + 62979.

It is an arithmetic number, because the mean of its divisors is an integer number (2684220).

Almost surely, 2^51866385 is an apocalyptic number.

It is an amenable number.

51866385 is a deficient number, since it is larger than the sum of its proper divisors (34028655).

51866385 is a wasteful number, since it uses less digits than its factorization.

51866385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977.

The product of its digits is 172800, while the sum is 42.

The square root of 51866385 is about 7201.8320585806. The cubic root of 51866385 is about 372.9311494987.

The spelling of 51866385 in words is "fifty-one million, eight hundred sixty-six thousand, three hundred eighty-five".