51660288 has 160 divisors (see below), whose sum is σ = 158605920. Its totient is φ = 16588800.

The previous prime is 51660269. The next prime is 51660293. The reversal of 51660288 is 88206615.

It is a happy number.

51660288 is a `hidden beast` number, since 516 + 60 + 2 + 88 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 511438 + ... + 511538.

It is an arithmetic number, because the mean of its divisors is an integer number (991287).

Almost surely, 2^51660288 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 51660288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79302960).

51660288 is an abundant number, since it is smaller than the sum of its proper divisors (106945632).

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

51660288 is a wasteful number, since it uses less digits than its factorization.

51660288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 51660288 is about 7187.5091652115. The cubic root of 51660288 is about 372.4365322854.

The spelling of 51660288 in words is "fifty-one million, six hundred sixty thousand, two hundred eighty-eight".