51780762840 has 64 divisors (see below), whose sum is σ = 155441986560. Its totient is φ = 13799341440.

The previous prime is 51780762823. The next prime is 51780762851. The reversal of 51780762840 is 4826708715.

It is a self number, because there is not a number n which added to its sum of digits gives 51780762840.

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, 50355 + ... + 325725.

It is an arithmetic number, because the mean of its divisors is an integer number (2428781040).

Almost surely, 2^51780762840 is an apocalyptic number.

It is an amenable number.

51780762840 is an abundant number, since it is smaller than the sum of its proper divisors (103661223720).

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

51780762840 is a wasteful number, since it uses less digits than its factorization.

51780762840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276952 (or 276948 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The spelling of 51780762840 in words is "fifty-one billion, seven hundred eighty million, seven hundred sixty-two thousand, eight hundred forty".