51688966 has 16 divisors (see below), whose sum is σ = 91468800. Its totient is φ = 21437640.

The previous prime is 51688927. The next prime is 51688969. The reversal of 51688966 is 66988615.

It is a super-2 number, since 2×51688966² = 5343498412298312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51688969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59116 + ... + 59983.

It is an arithmetic number, because the mean of its divisors is an integer number (5716800).

Almost surely, 2^51688966 is an apocalyptic number.

51688966 is a deficient number, since it is larger than the sum of its proper divisors (39779834).

51688966 is a wasteful number, since it uses less digits than its factorization.

51688966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119139.

The product of its digits is 622080, while the sum is 49.

The square root of 51688966 is about 7189.5038771810. The cubic root of 51688966 is about 372.5054360121.

The spelling of 51688966 in words is "fifty-one million, six hundred eighty-eight thousand, nine hundred sixty-six".