51688779 has 8 divisors (see below), whose sum is σ = 70086720. Its totient is φ = 33875016.

The previous prime is 51688771. The next prime is 51688807. The reversal of 51688779 is 97788615.

51688779 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.

It is not a de Polignac number, because 51688779 - 2³ = 51688771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51688771) 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 7 ways as a sum of consecutive naturals, for example, 145837 + ... + 146190.

It is an arithmetic number, because the mean of its divisors is an integer number (8760840).

Almost surely, 2^51688779 is an apocalyptic number.

51688779 is a gapful number since it is divisible by the number (59) formed by its first and last digit.

51688779 is a deficient number, since it is larger than the sum of its proper divisors (18397941).

51688779 is a wasteful number, since it uses less digits than its factorization.

51688779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292089.

The product of its digits is 846720, while the sum is 51.

The square root of 51688779 is about 7189.4908720994. The cubic root of 51688779 is about 372.5049867957.

The spelling of 51688779 in words is "fifty-one million, six hundred eighty-eight thousand, seven hundred seventy-nine".