51081768 has 24 divisors (see below), whose sum is σ = 138346650. Its totient is φ = 17027232.

The previous prime is 51081743. The next prime is 51081773. The reversal of 51081768 is 86718015.

51081768 is a `hidden beast` number, since 510 + 81 + 7 + 68 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30669444 + 20412324 = 5538^2 + 4518^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 5 ways as a sum of consecutive naturals, for example, 354663 + ... + 354806.

Almost surely, 2^51081768 is an apocalyptic number.

It is an amenable number.

51081768 is an abundant number, since it is smaller than the sum of its proper divisors (87264882).

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

51081768 is a wasteful number, since it uses less digits than its factorization.

51081768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709481 (or 709474 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 51081768 is about 7147.1510407994. The cubic root of 51081768 is about 371.0410612230.

The spelling of 51081768 in words is "fifty-one million, eighty-one thousand, seven hundred sixty-eight".