28356019 has 2 divisors, whose sum is σ = 28356020. Its totient is φ = 28356018.

The previous prime is 28355981. The next prime is 28356043. The reversal of 28356019 is 91065382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28356019 - 2⁷ = 28355891 is a prime.

It is a super-2 number, since 2×28356019² = 1608127627056722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28356059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178009 + 14178010.

It is an arithmetic number, because the mean of its divisors is an integer number (14178010).

Almost surely, 2^28356019 is an apocalyptic number.

28356019 is a deficient number, since it is larger than the sum of its proper divisors (1).

28356019 is an equidigital number, since it uses as much as digits as its factorization.

28356019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28356019 is about 5325.0369951767. The cubic root of 28356019 is about 304.9404846698.

The spelling of 28356019 in words is "twenty-eight million, three hundred fifty-six thousand, nineteen".