51857286 has 32 divisors (see below), whose sum is σ = 112519680. Its totient is φ = 15837984.

The previous prime is 51857261. The next prime is 51857287. The reversal of 51857286 is 68275815.

51857286 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51857286² = 5378356222571592, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51857287) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8451 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (3516240).

Almost surely, 2^51857286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51857286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56259840).

51857286 is an abundant number, since it is smaller than the sum of its proper divisors (60662394).

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

51857286 is a wasteful number, since it uses less digits than its factorization.

51857286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940.

The product of its digits is 134400, while the sum is 42.

The square root of 51857286 is about 7201.2003166139. The cubic root of 51857286 is about 372.9093402609.

The spelling of 51857286 in words is "fifty-one million, eight hundred fifty-seven thousand, two hundred eighty-six".