28028619 has 16 divisors (see below), whose sum is σ = 42864640. Its totient is φ = 18082440.

The previous prime is 28028593. The next prime is 28028641. The reversal of 28028619 is 91682082.

It is not a de Polignac number, because 28028619 - 2⁷ = 28028491 is a prime.

It is a super-2 number, since 2×28028619² = 1571206966094322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28028659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15907 + ... + 17580.

It is an arithmetic number, because the mean of its divisors is an integer number (2679040).

Almost surely, 2^28028619 is an apocalyptic number.

28028619 is a deficient number, since it is larger than the sum of its proper divisors (14836021).

28028619 is a wasteful number, since it uses less digits than its factorization.

28028619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33527 (or 33521 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28028619 is about 5294.2061727893. The cubic root of 28028619 is about 303.7623192687.

The spelling of 28028619 in words is "twenty-eight million, twenty-eight thousand, six hundred nineteen".