51423728 has 60 divisors (see below), whose sum is σ = 109133640. Its totient is φ = 23442048.

The previous prime is 51423721. The next prime is 51423733. The reversal of 51423728 is 82732415.

It is a junction number, because it is equal to n+sod(n) for n = 51423694 and 51423703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51423721) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 167351 + ... + 167657.

It is an arithmetic number, because the mean of its divisors is an integer number (1818894).

Almost surely, 2^51423728 is an apocalyptic number.

51423728 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51423728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54566820).

51423728 is an abundant number, since it is smaller than the sum of its proper divisors (57709912).

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

51423728 is a wasteful number, since it uses less digits than its factorization.

51423728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 357 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 51423728 is about 7171.0339561321. The cubic root of 51423728 is about 371.8671819367.

It can be divided in two parts, 514 and 23728, that added together give a palindrome (24242).

The spelling of 51423728 in words is "fifty-one million, four hundred twenty-three thousand, seven hundred twenty-eight".