51520044 has 24 divisors (see below), whose sum is σ = 120335040. Its totient is φ = 17155984.

The previous prime is 51520043. The next prime is 51520093. The reversal of 51520044 is 44002515.

It is a self number, because there is not a number n which added to its sum of digits gives 51520044.

It is not an unprimeable number, because it can be changed into a prime (51520043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16867 + ... + 19685.

It is an arithmetic number, because the mean of its divisors is an integer number (5013960).

Almost surely, 2^51520044 is an apocalyptic number.

It is an amenable number.

51520044 is an abundant number, since it is smaller than the sum of its proper divisors (68814996).

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

51520044 is a wasteful number, since it uses less digits than its factorization.

51520044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4349 (or 4347 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 51520044 is about 7177.7464430001. The cubic root of 51520044 is about 372.0992046668.

Adding to 51520044 its reverse (44002515), we get a palindrome (95522559).

The spelling of 51520044 in words is "fifty-one million, five hundred twenty thousand, forty-four".