51324840 has 320 divisors, whose sum is σ = 206300160. Its totient is φ = 11197440.

The previous prime is 51324839. The next prime is 51324857. The reversal of 51324840 is 4842315.

51324840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 703044 + ... + 703116.

It is an arithmetic number, because the mean of its divisors is an integer number (644688).

Almost surely, 2^51324840 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 51324840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103150080).

51324840 is an abundant number, since it is smaller than the sum of its proper divisors (154975320).

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

51324840 is a wasteful number, since it uses less digits than its factorization.

51324840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 51324840 is about 7164.1356771072. The cubic root of 51324840 is about 371.6286617036.

The spelling of 51324840 in words is "fifty-one million, three hundred twenty-four thousand, eight hundred forty".