51478647 has 16 divisors (see below), whose sum is σ = 75091968. Its totient is φ = 31110080.

The previous prime is 51478643. The next prime is 51478649. The reversal of 51478647 is 74687415.

It is a cyclic number.

It is not a de Polignac number, because 51478647 - 2² = 51478643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51478599 and 51478608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51478643) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10603 + ... + 14675.

It is an arithmetic number, because the mean of its divisors is an integer number (4693248).

Almost surely, 2^51478647 is an apocalyptic number.

51478647 is a deficient number, since it is larger than the sum of its proper divisors (23613321).

51478647 is a wasteful number, since it uses less digits than its factorization.

51478647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470.

The product of its digits is 188160, while the sum is 42.

The square root of 51478647 is about 7174.8621589547. The cubic root of 51478647 is about 371.9995158394. Note that the first 3 decimals are identical.

It can be divided in two parts, 51478 and 647, that added together give a palindrome (52125).

The spelling of 51478647 in words is "fifty-one million, four hundred seventy-eight thousand, six hundred forty-seven".