28778687782 has 32 divisors (see below), whose sum is σ = 49976640000. Its totient is φ = 12315652128.

The previous prime is 28778687767. The next prime is 28778687783.

It is a happy number.

28778687782 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778687783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596532 + ... + 642967.

It is an arithmetic number, because the mean of its divisors is an integer number (1561770000).

Almost surely, 2^28778687782 is an apocalyptic number.

28778687782 is a deficient number, since it is larger than the sum of its proper divisors (21197952218).

28778687782 is a wasteful number, since it uses less digits than its factorization.

28778687782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239580.

The product of its digits is 236027904, while the sum is 70.

The spelling of 28778687782 in words is "twenty-eight billion, seven hundred seventy-eight million, six hundred eighty-seven thousand, seven hundred eighty-two".