28065819 has 16 divisors (see below), whose sum is σ = 40310784. Its totient is φ = 17318400.

The previous prime is 28065809. The next prime is 28065839. The reversal of 28065819 is 91856082.

It is not a de Polignac number, because 28065819 - 2¹¹ = 28063771 is a prime.

It is a super-2 number, since 2×28065819² = 1575380392281522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28065809) 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, 4422 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (2519424).

Almost surely, 2^28065819 is an apocalyptic number.

28065819 is a deficient number, since it is larger than the sum of its proper divisors (12244965).

28065819 is a wasteful number, since it uses less digits than its factorization.

28065819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13178.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28065819 is about 5297.7182824307. The cubic root of 28065819 is about 303.8966458154.

The spelling of 28065819 in words is "twenty-eight million, sixty-five thousand, eight hundred nineteen".