28019845 has 16 divisors (see below), whose sum is σ = 38534400. Its totient is φ = 19160064.

The previous prime is 28019837. The next prime is 28019857. The reversal of 28019845 is 54891082.

It is not a de Polignac number, because 28019845 - 2³ = 28019837 is a prime.

It is a super-2 number, since 2×28019845² = 1570223427648050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14824 + ... + 16606.

It is an arithmetic number, because the mean of its divisors is an integer number (2408400).

Almost surely, 2^28019845 is an apocalyptic number.

It is an amenable number.

28019845 is a deficient number, since it is larger than the sum of its proper divisors (10514555).

28019845 is a wasteful number, since it uses less digits than its factorization.

28019845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28019845 is about 5293.3774662308. The cubic root of 28019845 is about 303.7306196603.

The spelling of 28019845 in words is "twenty-eight million, nineteen thousand, eight hundred forty-five".