28811491 has 2 divisors, whose sum is σ = 28811492. Its totient is φ = 28811490.

The previous prime is 28811473. The next prime is 28811509. The reversal of 28811491 is 19411882.

It is a balanced prime because it is at equal distance from previous prime (28811473) and next prime (28811509).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28811491 is a prime.

It is not a weakly prime, because it can be changed into another prime (28811401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14405745 + 14405746.

It is an arithmetic number, because the mean of its divisors is an integer number (14405746).

Almost surely, 2^28811491 is an apocalyptic number.

28811491 is a deficient number, since it is larger than the sum of its proper divisors (1).

28811491 is an equidigital number, since it uses as much as digits as its factorization.

28811491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 34.

The square root of 28811491 is about 5367.6336499430. The cubic root of 28811491 is about 306.5645344890.

The spelling of 28811491 in words is "twenty-eight million, eight hundred eleven thousand, four hundred ninety-one".