6428555191780 has 24 divisors (see below), whose sum is σ = 13500099527040. Its totient is φ = 2571396624480.

The previous prime is 6428555191727. The next prime is 6428555191819. The reversal of 6428555191780 is 871915558246.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 550645 + ... + 3627715.

It is an arithmetic number, because the mean of its divisors is an integer number (562504146960).

Almost surely, 2^{6428555191780} is an apocalyptic number.

It is an amenable number.

6428555191780 is an abundant number, since it is smaller than the sum of its proper divisors (7071544335260).

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

6428555191780 is a wasteful number, since it uses less digits than its factorization.

6428555191780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3181539 (or 3181537 counting only the distinct ones).

The product of its (nonzero) digits is 24192000, while the sum is 61.

The spelling of 6428555191780 in words is "six trillion, four hundred twenty-eight billion, five hundred fifty-five million, one hundred ninety-one thousand, seven hundred eighty".