51402768 has 80 divisors (see below), whose sum is σ = 138193536. Its totient is φ = 16450560.

The previous prime is 51402763. The next prime is 51402779. The reversal of 51402768 is 86720415.

It is not an unprimeable number, because it can be changed into a prime (51402763) 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 15 ways as a sum of consecutive naturals, for example, 182788 + ... + 183068.

Almost surely, 2^51402768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51402768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69096768).

51402768 is an abundant number, since it is smaller than the sum of its proper divisors (86790768).

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

51402768 is a wasteful number, since it uses less digits than its factorization.

51402768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 51402768 is about 7169.5723721851. The cubic root of 51402768 is about 371.8166514673.

The spelling of 51402768 in words is "fifty-one million, four hundred two thousand, seven hundred sixty-eight".