51320160 has 144 divisors (see below), whose sum is σ = 177021936. Its totient is φ = 13538304.

The previous prime is 51320141. The next prime is 51320173. The reversal of 51320160 is 6102315.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 225967 + ... + 226193.

It is an arithmetic number, because the mean of its divisors is an integer number (1229319).

Almost surely, 2^51320160 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 51320160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88510968).

51320160 is an abundant number, since it is smaller than the sum of its proper divisors (125701776).

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

51320160 is a wasteful number, since it uses less digits than its factorization.

51320160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 51320160 is about 7163.8090426811. The cubic root of 51320160 is about 371.6173658412.

Adding to 51320160 its reverse (6102315), we get a palindrome (57422475).

The spelling of 51320160 in words is "fifty-one million, three hundred twenty thousand, one hundred sixty".