28778136912 has 240 divisors, whose sum is σ = 97404622848. Its totient is φ = 7753616640.

The previous prime is 28778136901. The next prime is 28778136931. The reversal of 28778136912 is 21963187782.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1637323 + ... + 1654805.

Almost surely, 2^28778136912 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28778136912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48702311424).

28778136912 is an abundant number, since it is smaller than the sum of its proper divisors (68626485936).

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

28778136912 is a wasteful number, since it uses less digits than its factorization.

28778136912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17598 (or 17589 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 28778136912 in words is "twenty-eight billion, seven hundred seventy-eight million, one hundred thirty-six thousand, nine hundred twelve".