51990528 has 52 divisors (see below), whose sum is σ = 138657248. Its totient is φ = 17326080.

The previous prime is 51990481. The next prime is 51990529. The reversal of 51990528 is 82509915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51990529) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10173 + ... + 14403.

Almost surely, 2^51990528 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 51990528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69328624).

51990528 is an abundant number, since it is smaller than the sum of its proper divisors (86666720).

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

51990528 is an equidigital number, since it uses as much as digits as its factorization.

51990528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4258 (or 4236 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 51990528 is about 7210.4457559849. The cubic root of 51990528 is about 373.2284512634.

The spelling of 51990528 in words is "fifty-one million, nine hundred ninety thousand, five hundred twenty-eight".