51139528 has 48 divisors (see below), whose sum is σ = 108491760. Its totient is φ = 22411200.

The previous prime is 51139523. The next prime is 51139531. The reversal of 51139528 is 82593115.

It is a junction number, because it is equal to n+sod(n) for n = 51139493 and 51139502.

It is not an unprimeable number, because it can be changed into a prime (51139523) 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, 73663 + ... + 74353.

It is an arithmetic number, because the mean of its divisors is an integer number (2260245).

Almost surely, 2^51139528 is an apocalyptic number.

51139528 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 51139528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54245880).

51139528 is an abundant number, since it is smaller than the sum of its proper divisors (57352232).

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

51139528 is a wasteful number, since it uses less digits than its factorization.

51139528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766 (or 733 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 51139528 is about 7151.1906700912. The cubic root of 51139528 is about 371.1808583879.

It can be divided in two parts, 5113 and 9528, that added together give a palindrome (14641).

The spelling of 51139528 in words is "fifty-one million, one hundred thirty-nine thousand, five hundred twenty-eight".