28866550331 has 2 divisors, whose sum is σ = 28866550332. Its totient is φ = 28866550330.

The previous prime is 28866550327. The next prime is 28866550351. The reversal of 28866550331 is 13305566882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28866550331 - 2² = 28866550327 is a prime.

It is a super-2 number, since 2×28866550331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28866550351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14433275165 + 14433275166.

It is an arithmetic number, because the mean of its divisors is an integer number (14433275166).

Almost surely, 2^28866550331 is an apocalyptic number.

28866550331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28866550331 is an equidigital number, since it uses as much as digits as its factorization.

28866550331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 28866550331 in words is "twenty-eight billion, eight hundred sixty-six million, five hundred fifty thousand, three hundred thirty-one".