51286656 has 32 divisors (see below), whose sum is σ = 136231200. Its totient is φ = 17095424.

The previous prime is 51286607. The next prime is 51286657. The reversal of 51286656 is 65668215.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (51286657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66396 + ... + 67163.

It is an arithmetic number, because the mean of its divisors is an integer number (4257225).

Almost surely, 2^51286656 is an apocalyptic number.

It is an amenable number.

51286656 is an abundant number, since it is smaller than the sum of its proper divisors (84944544).

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

51286656 is a wasteful number, since it uses less digits than its factorization.

51286656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133576 (or 133564 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 51286656 is about 7161.4702401113. The cubic root of 51286656 is about 371.5364789886.

The spelling of 51286656 in words is "fifty-one million, two hundred eighty-six thousand, six hundred fifty-six".