51209968 has 20 divisors (see below), whose sum is σ = 99773128. Its totient is φ = 25462080.

The previous prime is 51209941. The next prime is 51209987. The reversal of 51209968 is 86990215.

51209968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51209968² = 5244921645122048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51209968.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5946 + ... + 11737.

Almost surely, 2^51209968 is an apocalyptic number.

It is an amenable number.

51209968 is a deficient number, since it is larger than the sum of its proper divisors (48563160).

51209968 is a wasteful number, since it uses less digits than its factorization.

51209968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17872 (or 17866 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 51209968 is about 7156.1140292759. The cubic root of 51209968 is about 371.3512027074.

The spelling of 51209968 in words is "fifty-one million, two hundred nine thousand, nine hundred sixty-eight".