28288742821 has 16 divisors (see below), whose sum is σ = 29386685440. Its totient is φ = 27202728960.

The previous prime is 28288742771. The next prime is 28288742851. The reversal of 28288742821 is 12824788282.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28288742821 - 2⁹ = 28288742309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28288742851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6393616 + ... + 6398038.

It is an arithmetic number, because the mean of its divisors is an integer number (1836667840).

Almost surely, 2^28288742821 is an apocalyptic number.

It is an amenable number.

28288742821 is a deficient number, since it is larger than the sum of its proper divisors (1097942619).

28288742821 is a wasteful number, since it uses less digits than its factorization.

28288742821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716.

The product of its digits is 1835008, while the sum is 52.

The spelling of 28288742821 in words is "twenty-eight billion, two hundred eighty-eight million, seven hundred forty-two thousand, eight hundred twenty-one".