51878447 has 4 divisors (see below), whose sum is σ = 51904200. Its totient is φ = 51852696.

The previous prime is 51878443. The next prime is 51878471. The reversal of 51878447 is 74487815.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51878447 - 2² = 51878443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51878398 and 51878407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51878443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9572 + ... + 13977.

It is an arithmetic number, because the mean of its divisors is an integer number (12976050).

Almost surely, 2^51878447 is an apocalyptic number.

51878447 is a deficient number, since it is larger than the sum of its proper divisors (25753).

51878447 is a wasteful number, since it uses less digits than its factorization.

51878447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25752.

The product of its digits is 250880, while the sum is 44.

The square root of 51878447 is about 7202.6694357023. The cubic root of 51878447 is about 372.9600567692.

It can be divided in two parts, 51878 and 447, that added together give a palindrome (52325).

The spelling of 51878447 in words is "fifty-one million, eight hundred seventy-eight thousand, four hundred forty-seven".