51381760 has 40 divisors (see below), whose sum is σ = 123201936. Its totient is φ = 20551680.

The previous prime is 51381749. The next prime is 51381797. The reversal of 51381760 is 6718315.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7476 + ... + 12595.

Almost surely, 2^51381760 is an apocalyptic number.

It is an amenable number.

51381760 is an abundant number, since it is smaller than the sum of its proper divisors (71820176).

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

51381760 is an equidigital number, since it uses as much as digits as its factorization.

51381760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20094 (or 20078 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 51381760 is about 7168.1071420564. The cubic root of 51381760 is about 371.7659914939.

The spelling of 51381760 in words is "fifty-one million, three hundred eighty-one thousand, seven hundred sixty".