28355019 has 24 divisors (see below), whose sum is σ = 47496960. Its totient is φ = 14728560.

The previous prime is 28354999. The next prime is 28355023. The reversal of 28355019 is 91055382.

It is not a de Polignac number, because 28355019 - 2⁷ = 28354891 is a prime.

It is a super-2 number, since 2×28355019² = 1608014204980722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28355029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3039 + ... + 8120.

It is an arithmetic number, because the mean of its divisors is an integer number (1979040).

Almost surely, 2^28355019 is an apocalyptic number.

28355019 is a deficient number, since it is larger than the sum of its proper divisors (19141941).

28355019 is a wasteful number, since it uses less digits than its factorization.

28355019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11191 (or 11180 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 28355019 is about 5324.9430982875. The cubic root of 28355019 is about 304.9368999626.

The spelling of 28355019 in words is "twenty-eight million, three hundred fifty-five thousand, nineteen".