51306656 has 12 divisors (see below), whose sum is σ = 101010042. Its totient is φ = 25653312.

The previous prime is 51306649. The next prime is 51306683. The reversal of 51306656 is 65660315.

It can be written as a sum of positive squares in only one way, i.e., 50183056 + 1123600 = 7084^2 + 1060^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 1603333 = 51306656 / (5 + 1 + 3 + 0 + 6 + 6 + 5 + 6).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 801635 + ... + 801698.

Almost surely, 2^51306656 is an apocalyptic number.

It is an amenable number.

51306656 is a deficient number, since it is larger than the sum of its proper divisors (49703386).

51306656 is a wasteful number, since it uses less digits than its factorization.

51306656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603343 (or 1603335 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 51306656 is about 7162.8664653196. The cubic root of 51306656 is about 371.5847681178.

The spelling of 51306656 in words is "fifty-one million, three hundred six thousand, six hundred fifty-six".