2780356164820 has 24 divisors (see below), whose sum is σ = 6287882404104. Its totient is φ = 1026593045376.

The previous prime is 2780356164779. The next prime is 2780356164841. The reversal of 2780356164820 is 284616530872.

It can be written as a sum of positive squares in 4 ways, for example, as 571880787984 + 2208475376836 = 756228^2 + 1486094^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5346838519 + ... + 5346839038.

It is an arithmetic number, because the mean of its divisors is an integer number (261995100171).

Almost surely, 2^{2780356164820} is an apocalyptic number.

2780356164820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2780356164820 is an abundant number, since it is smaller than the sum of its proper divisors (3507526239284).

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

2780356164820 is a wasteful number, since it uses less digits than its factorization.

2780356164820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10693677579 (or 10693677577 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 2780356164820 in words is "two trillion, seven hundred eighty billion, three hundred fifty-six million, one hundred sixty-four thousand, eight hundred twenty".