51606978 has 8 divisors (see below), whose sum is σ = 103213968. Its totient is φ = 17202324.

The previous prime is 51606967. The next prime is 51606991. The reversal of 51606978 is 87960615.

51606978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

51606978 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, 4300576 + ... + 4300587.

It is an arithmetic number, because the mean of its divisors is an integer number (12901746).

Almost surely, 2^51606978 is an apocalyptic number.

51606978 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.

51606978 is a wasteful number, since it uses less digits than its factorization.

51606978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8601168.

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 51606978 is about 7183.7996909713. The cubic root of 51606978 is about 372.3083782380.

The spelling of 51606978 in words is "fifty-one million, six hundred six thousand, nine hundred seventy-eight".