51530752 has 132 divisors (see below), whose sum is σ = 130680480. Its totient is φ = 20127744.

The previous prime is 51530749. The next prime is 51530779. The reversal of 51530752 is 25703515.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 51530752.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 652249 + ... + 652327.

Almost surely, 2^51530752 is an apocalyptic number.

51530752 is a gapful number since it is divisible by the number (52) 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 51530752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65340240).

51530752 is an abundant number, since it is smaller than the sum of its proper divisors (79149728).

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

51530752 is a wasteful number, since it uses less digits than its factorization.

51530752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 51530752 is about 7178.4923208150. The cubic root of 51530752 is about 372.1249820922.

The spelling of 51530752 in words is "fifty-one million, five hundred thirty thousand, seven hundred fifty-two".