51213768 has 32 divisors (see below), whose sum is σ = 132451200. Its totient is φ = 16482368.

The previous prime is 51213761. The next prime is 51213781. The reversal of 51213768 is 86731215.

51213768 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51213761) 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, 36096 + ... + 37487.

It is an arithmetic number, because the mean of its divisors is an integer number (4139100).

Almost surely, 2^51213768 is an apocalyptic number.

51213768 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

51213768 is an abundant number, since it is smaller than the sum of its proper divisors (81237432).

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

51213768 is a wasteful number, since it uses less digits than its factorization.

51213768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73621 (or 73617 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 51213768 is about 7156.3795315788. The cubic root of 51213768 is about 371.3603877660.

The spelling of 51213768 in words is "fifty-one million, two hundred thirteen thousand, seven hundred sixty-eight".