51421782840 has 64 divisors (see below), whose sum is σ = 154378690560. Its totient is φ = 13702400640.

The previous prime is 51421782833. The next prime is 51421782857. The reversal of 51421782840 is 4828712415.

It is a junction number, because it is equal to n+sod(n) for n = 51421782792 and 51421782801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7305 + ... + 320775.

It is an arithmetic number, because the mean of its divisors is an integer number (2412167040).

Almost surely, 2^51421782840 is an apocalyptic number.

It is an amenable number.

51421782840 is an abundant number, since it is smaller than the sum of its proper divisors (102956907720).

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

51421782840 is a wasteful number, since it uses less digits than its factorization.

51421782840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314852 (or 314848 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 51421782840 in words is "fifty-one billion, four hundred twenty-one million, seven hundred eighty-two thousand, eight hundred forty".