28233121787 has 16 divisors (see below), whose sum is σ = 30522145920. Its totient is φ = 25961040000.

The previous prime is 28233121781. The next prime is 28233121817. The reversal of 28233121787 is 78712133282.

It is a cyclic number.

It is not a de Polignac number, because 28233121787 - 2¹⁸ = 28232859643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28233121781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4106789 + ... + 4113657.

It is an arithmetic number, because the mean of its divisors is an integer number (1907634120).

Almost surely, 2^28233121787 is an apocalyptic number.

28233121787 is a deficient number, since it is larger than the sum of its proper divisors (2289024133).

28233121787 is a wasteful number, since it uses less digits than its factorization.

28233121787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054.

The product of its digits is 225792, while the sum is 44.

The spelling of 28233121787 in words is "twenty-eight billion, two hundred thirty-three million, one hundred twenty-one thousand, seven hundred eighty-seven".