28028104 has 64 divisors (see below), whose sum is σ = 60963840. Its totient is φ = 11965440.

The previous prime is 28028101. The next prime is 28028107. The reversal of 28028104 is 40182082.

It is an interprime number because it is at equal distance from previous prime (28028101) and next prime (28028107).

It is a super-2 number, since 2×28028104² = 1571149227669632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28028101) 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 15 ways as a sum of consecutive naturals, for example, 146649 + ... + 146839.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^28028104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28028104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30481920).

28028104 is an abundant number, since it is smaller than the sum of its proper divisors (32935736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28028104 is a wasteful number, since it uses less digits than its factorization.

28028104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28028104 is about 5294.1575344903. The cubic root of 28028104 is about 303.7604588066.

The spelling of 28028104 in words is "twenty-eight million, twenty-eight thousand, one hundred four".