28229520779 has 16 divisors (see below), whose sum is σ = 29674188000. Its totient is φ = 26819702784.

The previous prime is 28229520763. The next prime is 28229520791. The reversal of 28229520779 is 97702592282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28229520779 - 2⁴ = 28229520763 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28229520779.

It is not an unprimeable number, because it can be changed into a prime (28229520749) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 431819 + ... + 492875.

It is an arithmetic number, because the mean of its divisors is an integer number (1854636750).

Almost surely, 2^28229520779 is an apocalyptic number.

28229520779 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28229520779 is a deficient number, since it is larger than the sum of its proper divisors (1444667221).

28229520779 is a wasteful number, since it uses less digits than its factorization.

28229520779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61342.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 28229520779 in words is "twenty-eight billion, two hundred twenty-nine million, five hundred twenty thousand, seven hundred seventy-nine".