51806512 has 20 divisors (see below), whose sum is σ = 103089136. Its totient is φ = 25202880.

The previous prime is 51806509. The next prime is 51806519. The reversal of 51806512 is 21560815.

It is a super-2 number, since 2×51806512² = 5367829371212288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51806519) 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, 43164 + ... + 44347.

Almost surely, 2^51806512 is an apocalyptic number.

It is an amenable number.

51806512 is a deficient number, since it is larger than the sum of its proper divisors (51282624).

51806512 is a wasteful number, since it uses less digits than its factorization.

51806512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87556 (or 87550 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 51806512 is about 7197.6740687530. The cubic root of 51806512 is about 372.7875940661.

The spelling of 51806512 in words is "fifty-one million, eight hundred six thousand, five hundred twelve".