28077798066 has 32 divisors (see below), whose sum is σ = 56324256576. Its totient is φ = 9331200000.

The previous prime is 28077798061. The next prime is 28077798109. The reversal of 28077798066 is 66089777082.

It is not an unprimeable number, because it can be changed into a prime (28077798061) 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, 2919666 + ... + 2929266.

It is an arithmetic number, because the mean of its divisors is an integer number (1760133018).

Almost surely, 2^28077798066 is an apocalyptic number.

28077798066 is an abundant number, since it is smaller than the sum of its proper divisors (28246458510).

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

28077798066 is a wasteful number, since it uses less digits than its factorization.

28077798066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11018.

The product of its (nonzero) digits is 14224896, while the sum is 60.

The spelling of 28077798066 in words is "twenty-eight billion, seventy-seven million, seven hundred ninety-eight thousand, sixty-six".