28002005491 has 2 divisors, whose sum is σ = 28002005492. Its totient is φ = 28002005490.

The previous prime is 28002005443. The next prime is 28002005509. The reversal of 28002005491 is 19450020082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28002005491 - 2⁷ = 28002005363 is a prime.

It is a super-2 number, since 2×28002005491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28002005401) 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 as a sum of consecutive naturals, namely, 14001002745 + 14001002746.

It is an arithmetic number, because the mean of its divisors is an integer number (14001002746).

Almost surely, 2^28002005491 is an apocalyptic number.

28002005491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28002005491 is an equidigital number, since it uses as much as digits as its factorization.

28002005491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 28002005491 in words is "twenty-eight billion, two million, five thousand, four hundred ninety-one".