28777444477782 has 128 divisors (see below), whose sum is σ = 79161287482368. Its totient is φ = 6731401881600.

The previous prime is 28777444477711. The next prime is 28777444477787.

28777444477782 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 28777444477698 and 28777444477707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777444477787) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58186063 + ... + 58678554.

It is an arithmetic number, because the mean of its divisors is an integer number (618447558456).

Almost surely, 2^{28777444477782} is an apocalyptic number.

28777444477782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28777444477782 is an abundant number, since it is smaller than the sum of its proper divisors (50383843004586).

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

28777444477782 is a wasteful number, since it uses less digits than its factorization.

28777444477782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116864694.

The product of its digits is 7710244864, while the sum is 78.

The spelling of 28777444477782 in words is "twenty-eight trillion, seven hundred seventy-seven billion, four hundred forty-four million, four hundred seventy-seven thousand, seven hundred eighty-two".