51278668 has 12 divisors (see below), whose sum is σ = 102557392. Its totient is φ = 21976560.

The previous prime is 51278657. The next prime is 51278671. The reversal of 51278668 is 86687215.

51278668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

51278668 is an admirable number.

It is an unprimeable number.

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, 915663 + ... + 915718.

Almost surely, 2^51278668 is an apocalyptic number.

It is an amenable number.

51278668 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51278668 is a wasteful number, since it uses less digits than its factorization.

51278668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831392 (or 1831390 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 51278668 is about 7160.9125116845. The cubic root of 51278668 is about 371.5171888020.

The spelling of 51278668 in words is "fifty-one million, two hundred seventy-eight thousand, six hundred sixty-eight".