51320052 has 108 divisors (see below), whose sum is σ = 154365120. Its totient is φ = 14327712.

The previous prime is 51320047. The next prime is 51320077. The reversal of 51320052 is 25002315.

It is a happy number.

51320052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 82599 + ... + 83217.

Almost surely, 2^51320052 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 51320052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77182560).

51320052 is an abundant number, since it is smaller than the sum of its proper divisors (103045068).

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

51320052 is a wasteful number, since it uses less digits than its factorization.

51320052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 678 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 51320052 is about 7163.8015047878. The cubic root of 51320052 is about 371.6171051593.

Adding to 51320052 its reverse (25002315), we get a palindrome (76322367).

The spelling of 51320052 in words is "fifty-one million, three hundred twenty thousand, fifty-two".