51867918 has 32 divisors (see below), whose sum is σ = 122044320. Its totient is φ = 16272000.

The previous prime is 51867917. The next prime is 51867947. The reversal of 51867918 is 81976815.

51867918 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51867917) 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 15 ways as a sum of consecutive naturals, for example, 27333 + ... + 29168.

It is an arithmetic number, because the mean of its divisors is an integer number (3813885).

Almost surely, 2^51867918 is an apocalyptic number.

51867918 is an abundant number, since it is smaller than the sum of its proper divisors (70176402).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51867918 is a wasteful number, since it uses less digits than its factorization.

51867918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56529 (or 56523 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 51867918 is about 7201.9384890458. The cubic root of 51867918 is about 372.9348236692.

The spelling of 51867918 in words is "fifty-one million, eight hundred sixty-seven thousand, nine hundred eighteen".