1778020485780 has 432 divisors, whose sum is σ = 6643502909568. Its totient is φ = 347723059200.

The previous prime is 1778020485743. The next prime is 1778020485823. The reversal of 1778020485780 is 875840208771.

It is a super-2 number, since 2×1778020485780² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1778020485780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 14626450 + ... + 14747510.

Almost surely, 2^{1778020485780} is an apocalyptic number.

1778020485780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1778020485780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3321751454784).

1778020485780 is an abundant number, since it is smaller than the sum of its proper divisors (4865482423788).

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

1778020485780 is a wasteful number, since it uses less digits than its factorization.

1778020485780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121136 (or 121106 counting only the distinct ones).

The product of its (nonzero) digits is 7024640, while the sum is 57.

The spelling of 1778020485780 in words is "one trillion, seven hundred seventy-eight billion, twenty million, four hundred eighty-five thousand, seven hundred eighty".