51968649 has 8 divisors (see below), whose sum is σ = 70168960. Its totient is φ = 34207056.

The previous prime is 51968647. The next prime is 51968701. The reversal of 51968649 is 94686915.

51968649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51968649 - 2¹ = 51968647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51968598 and 51968607.

It is not an unprimeable number, because it can be changed into a prime (51968647) 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, 109402 + ... + 109875.

It is an arithmetic number, because the mean of its divisors is an integer number (8771120).

Almost surely, 2^51968649 is an apocalyptic number.

It is an amenable number.

51968649 is a deficient number, since it is larger than the sum of its proper divisors (18200311).

51968649 is a wasteful number, since it uses less digits than its factorization.

51968649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219359.

The product of its digits is 466560, while the sum is 48.

The square root of 51968649 is about 7208.9284224495. The cubic root of 51968649 is about 373.1760890907.

The spelling of 51968649 in words is "fifty-one million, nine hundred sixty-eight thousand, six hundred forty-nine".