28761821003 has 2 divisors, whose sum is σ = 28761821004. Its totient is φ = 28761821002.

The previous prime is 28761820993. The next prime is 28761821021. The reversal of 28761821003 is 30012816782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28761821003 - 2²⁰ = 28760772427 is a prime.

It is a super-2 number, since 2×28761821003² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28761821063) 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, 14380910501 + 14380910502.

It is an arithmetic number, because the mean of its divisors is an integer number (14380910502).

Almost surely, 2^28761821003 is an apocalyptic number.

28761821003 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761821003 is an equidigital number, since it uses as much as digits as its factorization.

28761821003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 28761821003 in words is "twenty-eight billion, seven hundred sixty-one million, eight hundred twenty-one thousand, three".