28778755787782 has 32 divisors (see below), whose sum is σ = 57960011660544. Its totient is φ = 10350002080800.

The previous prime is 28778755787669. The next prime is 28778755787833.

It is a happy number.

28778755787782 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 28778755787693 and 28778755787702.

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, 7187499444 + ... + 7187503447.

It is an arithmetic number, because the mean of its divisors is an integer number (1811250364392).

Almost surely, 2^{28778755787782} is an apocalyptic number.

28778755787782 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28778755787782 is an abundant number, since it is smaller than the sum of its proper divisors (29181255872762).

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

28778755787782 is a wasteful number, since it uses less digits than its factorization.

28778755787782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14375002924.

The product of its digits is 48189030400, while the sum is 88.

The spelling of 28778755787782 in words is "twenty-eight trillion, seven hundred seventy-eight billion, seven hundred fifty-five million, seven hundred eighty-seven thousand, seven hundred eighty-two".