51787947 has 8 divisors (see below), whose sum is σ = 69224400. Its totient is φ = 34438400.

The previous prime is 51787907. The next prime is 51787979. The reversal of 51787947 is 74978715.

51787947 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 a cyclic number.

It is not a de Polignac number, because 51787947 - 2⁷ = 51787819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51787896 and 51787905.

It is not an unprimeable number, because it can be changed into a prime (51787907) 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, 20322 + ... + 22727.

It is an arithmetic number, because the mean of its divisors is an integer number (8653050).

Almost surely, 2^51787947 is an apocalyptic number.

51787947 is a deficient number, since it is larger than the sum of its proper divisors (17436453).

51787947 is a wasteful number, since it uses less digits than its factorization.

51787947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43453.

The product of its digits is 493920, while the sum is 48.

The square root of 51787947 is about 7196.3843004665. The cubic root of 51787947 is about 372.7430589406.

The spelling of 51787947 in words is "fifty-one million, seven hundred eighty-seven thousand, nine hundred forty-seven".