51859656 has 128 divisors (see below), whose sum is σ = 158112000. Its totient is φ = 15676416.

The previous prime is 51859651. The next prime is 51859697. The reversal of 51859656 is 65695815.

It is a happy number.

51859656 is a `hidden beast` number, since 5 + 1 + 8 + 596 + 56 = 666.

It is not an unprimeable number, because it can be changed into a prime (51859651) 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 31 ways as a sum of consecutive naturals, for example, 106245 + ... + 106731.

It is an arithmetic number, because the mean of its divisors is an integer number (1235250).

Almost surely, 2^51859656 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 51859656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79056000).

51859656 is an abundant number, since it is smaller than the sum of its proper divisors (106252344).

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

51859656 is a wasteful number, since it uses less digits than its factorization.

51859656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 538 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 51859656 is about 7201.3648706339. The cubic root of 51859656 is about 372.9150211191.

It can be divided in two parts, 5185 and 9656, that added together give a palindrome (14841).

The spelling of 51859656 in words is "fifty-one million, eight hundred fifty-nine thousand, six hundred fifty-six".