51520756 has 36 divisors (see below), whose sum is σ = 106178688. Its totient is φ = 21807408.

The previous prime is 51520753. The next prime is 51520757. The reversal of 51520756 is 65702515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520753) 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, 14685 + ... + 17851.

It is an arithmetic number, because the mean of its divisors is an integer number (2949408).

Almost surely, 2^51520756 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 51520756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53089344).

51520756 is an abundant number, since it is smaller than the sum of its proper divisors (54657932).

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

51520756 is a wasteful number, since it uses less digits than its factorization.

51520756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3268 (or 3259 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 51520756 is about 7177.7960405684. The cubic root of 51520756 is about 372.1009187790.

The spelling of 51520756 in words is "fifty-one million, five hundred twenty thousand, seven hundred fifty-six".