51389824 has 32 divisors (see below), whose sum is σ = 103458600. Its totient is φ = 25423872.

The previous prime is 51389809. The next prime is 51389831. The reversal of 51389824 is 42898315.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10347 + ... + 14485.

Almost surely, 2^51389824 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 51389824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51729300).

51389824 is an abundant number, since it is smaller than the sum of its proper divisors (52068776).

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

51389824 is an equidigital number, since it uses as much as digits as its factorization.

51389824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4250 (or 4238 counting only the distinct ones).

The product of its digits is 69120, while the sum is 40.

The square root of 51389824 is about 7168.6696115807. The cubic root of 51389824 is about 371.7854391483.

The spelling of 51389824 in words is "fifty-one million, three hundred eighty-nine thousand, eight hundred twenty-four".