51284478 has 96 divisors (see below), whose sum is σ = 130802688. Its totient is φ = 13305600.

The previous prime is 51284437. The next prime is 51284483. The reversal of 51284478 is 87448215.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 154773 + ... + 155103.

It is an arithmetic number, because the mean of its divisors is an integer number (1362528).

Almost surely, 2^51284478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51284478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65401344).

51284478 is an abundant number, since it is smaller than the sum of its proper divisors (79518210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51284478 is a wasteful number, since it uses less digits than its factorization.

51284478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398 (or 391 counting only the distinct ones).

The product of its digits is 71680, while the sum is 39.

The square root of 51284478 is about 7161.3181747497. The cubic root of 51284478 is about 371.5312195444.

The spelling of 51284478 in words is "fifty-one million, two hundred eighty-four thousand, four hundred seventy-eight".