51688020 has 48 divisors (see below), whose sum is σ = 145172160. Its totient is φ = 13741056.

The previous prime is 51688019. The next prime is 51688033. The reversal of 51688020 is 2088615.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21604 + ... + 23876.

It is an arithmetic number, because the mean of its divisors is an integer number (3024420).

Almost surely, 2^51688020 is an apocalyptic number.

It is an amenable number.

51688020 is an abundant number, since it is smaller than the sum of its proper divisors (93484140).

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

51688020 is a wasteful number, since it uses less digits than its factorization.

51688020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664 (or 2662 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 51688020 is about 7189.4380865267. The cubic root of 51688020 is about 372.5031634943.

The spelling of 51688020 in words is "fifty-one million, six hundred eighty-eight thousand, twenty".