51402168 has 32 divisors (see below), whose sum is σ = 142784400. Its totient is φ = 17133984.

The previous prime is 51402041. The next prime is 51402187. The reversal of 51402168 is 86120415.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118771 + ... + 119202.

Almost surely, 2^51402168 is an apocalyptic number.

It is an amenable number.

51402168 is an abundant number, since it is smaller than the sum of its proper divisors (91382232).

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

51402168 is a wasteful number, since it uses less digits than its factorization.

51402168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237988 (or 237978 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51402168 is about 7169.5305285632. The cubic root of 51402168 is about 371.8152047822.

It can be divided in two parts, 514021 and 68, that added together give a square (514089 = 717²).

The spelling of 51402168 in words is "fifty-one million, four hundred two thousand, one hundred sixty-eight".