28491019 has 2 divisors, whose sum is σ = 28491020. Its totient is φ = 28491018.

The previous prime is 28491017. The next prime is 28491037. The reversal of 28491019 is 91019482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28491019 - 2¹ = 28491017 is a prime.

It is a super-2 number, since 2×28491019² = 1623476327316722, which contains 22 as substring.

Together with 28491017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28491017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245509 + 14245510.

It is an arithmetic number, because the mean of its divisors is an integer number (14245510).

Almost surely, 2^28491019 is an apocalyptic number.

28491019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491019 is an equidigital number, since it uses as much as digits as its factorization.

28491019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 28491019 is about 5337.6979120216. The cubic root of 28491019 is about 305.4236484872.

The spelling of 28491019 in words is "twenty-eight million, four hundred ninety-one thousand, nineteen".