51207856 has 20 divisors (see below), whose sum is σ = 113389072. Its totient is φ = 21946176.

The previous prime is 51207847. The next prime is 51207857. The reversal of 51207856 is 65870215.

51207856 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 2×51207856² = 5244489032233472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51207857) 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 3 ways as a sum of consecutive naturals, for example, 228495 + ... + 228718.

Almost surely, 2^51207856 is an apocalyptic number.

51207856 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51207856 is an abundant number, since it is smaller than the sum of its proper divisors (62181216).

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

51207856 is a wasteful number, since it uses less digits than its factorization.

51207856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457228 (or 457222 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 51207856 is about 7155.9664616319. The cubic root of 51207856 is about 371.3460975521.

The spelling of 51207856 in words is "fifty-one million, two hundred seven thousand, eight hundred fifty-six".