28830287021 has 2 divisors, whose sum is σ = 28830287022. Its totient is φ = 28830287020.

The previous prime is 28830286999. The next prime is 28830287069. The reversal of 28830287021 is 12078203882.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28604956900 + 225330121 = 169130^2 + 15011^2 .

It is a cyclic number.

It is not a de Polignac number, because 28830287021 - 2³⁰ = 27756545197 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28830287021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28830287081) 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 as a sum of consecutive naturals, namely, 14415143510 + 14415143511.

It is an arithmetic number, because the mean of its divisors is an integer number (14415143511).

Almost surely, 2^28830287021 is an apocalyptic number.

It is an amenable number.

28830287021 is a deficient number, since it is larger than the sum of its proper divisors (1).

28830287021 is an equidigital number, since it uses as much as digits as its factorization.

28830287021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86016, while the sum is 41.

The spelling of 28830287021 in words is "twenty-eight billion, eight hundred thirty million, two hundred eighty-seven thousand, twenty-one".