51268720 has 20 divisors (see below), whose sum is σ = 119199960. Its totient is φ = 20507456.

The previous prime is 51268697. The next prime is 51268733. The reversal of 51268720 is 2786215.

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 320350 + ... + 320509.

It is an arithmetic number, because the mean of its divisors is an integer number (5959998).

Almost surely, 2^51268720 is an apocalyptic number.

It is an amenable number.

51268720 is an abundant number, since it is smaller than the sum of its proper divisors (67931240).

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

51268720 is a wasteful number, since it uses less digits than its factorization.

51268720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640872 (or 640866 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 51268720 is about 7160.2178737801. The cubic root of 51268720 is about 371.4931626188.

The spelling of 51268720 in words is "fifty-one million, two hundred sixty-eight thousand, seven hundred twenty".