51279843420 has 96 divisors (see below), whose sum is σ = 171809413440. Its totient is φ = 12622728960.

The previous prime is 51279843389. The next prime is 51279843421. The reversal of 51279843420 is 2434897215.

51279843420 is a `hidden beast` number, since 5 + 127 + 98 + 434 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51279843421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3645391 + ... + 3659430.

It is an arithmetic number, because the mean of its divisors is an integer number (1789681390).

Almost surely, 2^51279843420 is an apocalyptic number.

It is an amenable number.

51279843420 is an abundant number, since it is smaller than the sum of its proper divisors (120529570020).

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

51279843420 is a wasteful number, since it uses less digits than its factorization.

51279843420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7304852 (or 7304844 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 51279843420 in words is "fifty-one billion, two hundred seventy-nine million, eight hundred forty-three thousand, four hundred twenty".