51978447 has 12 divisors (see below), whose sum is σ = 76911744. Its totient is φ = 33806880.

The previous prime is 51978439. The next prime is 51978473. The reversal of 51978447 is 74487915.

It is a happy number.

It is not a de Polignac number, because 51978447 - 2³ = 51978439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51978427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70063 + ... + 70800.

It is an arithmetic number, because the mean of its divisors is an integer number (6409312).

Almost surely, 2^51978447 is an apocalyptic number.

51978447 is a deficient number, since it is larger than the sum of its proper divisors (24933297).

51978447 is a wasteful number, since it uses less digits than its factorization.

51978447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140910 (or 140907 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 51978447 is about 7209.6079643764. The cubic root of 51978447 is about 373.1995400855.

It can be divided in two parts, 51978 and 447, that added together give a palindrome (52425).

The spelling of 51978447 in words is "fifty-one million, nine hundred seventy-eight thousand, four hundred forty-seven".