51809044 has 24 divisors (see below), whose sum is σ = 104207040. Its totient is φ = 22077696.

The previous prime is 51809039. The next prime is 51809057. The reversal of 51809044 is 44090815.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51808997 and 51809015.

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 7 ways as a sum of consecutive naturals, for example, 157 + ... + 10180.

It is an arithmetic number, because the mean of its divisors is an integer number (4341960).

Almost surely, 2^51809044 is an apocalyptic number.

It is an amenable number.

51809044 is an abundant number, since it is smaller than the sum of its proper divisors (52397996).

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

51809044 is a wasteful number, since it uses less digits than its factorization.

51809044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10527 (or 10525 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 51809044 is about 7197.8499567579. The cubic root of 51809044 is about 372.7936671946.

Adding to 51809044 its reverse (44090815), we get a palindrome (95899859).

The spelling of 51809044 in words is "fifty-one million, eight hundred nine thousand, forty-four".