51771678 has 16 divisors (see below), whose sum is σ = 118335360. Its totient is φ = 14791896.

The previous prime is 51771667. The next prime is 51771679. The reversal of 51771678 is 87617715.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1232659 = 51771678 / (5 + 1 + 7 + 7 + 1 + 6 + 7 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51771679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 616288 + ... + 616371.

It is an arithmetic number, because the mean of its divisors is an integer number (7395960).

Almost surely, 2^51771678 is an apocalyptic number.

51771678 is an abundant number, since it is smaller than the sum of its proper divisors (66563682).

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

51771678 is a wasteful number, since it uses less digits than its factorization.

51771678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232671.

The product of its digits is 82320, while the sum is 42.

The square root of 51771678 is about 7195.2538523669. The cubic root of 51771678 is about 372.7040228823.

The spelling of 51771678 in words is "fifty-one million, seven hundred seventy-one thousand, six hundred seventy-eight".