28028616 has 128 divisors (see below), whose sum is σ = 90547200. Its totient is φ = 7015680.

The previous prime is 28028593. The next prime is 28028641. The reversal of 28028616 is 61682082.

28028616 = T₂₉ + T₃₀ + ... + T₅₅₁.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53331 + ... + 53853.

It is an arithmetic number, because the mean of its divisors is an integer number (707400).

Almost surely, 2^28028616 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 28028616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45273600).

28028616 is an abundant number, since it is smaller than the sum of its proper divisors (62518584).

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

28028616 is a wasteful number, since it uses less digits than its factorization.

28028616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 579 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 28028616 is about 5294.2058894607. The cubic root of 28028616 is about 303.7623084311.

The spelling of 28028616 in words is "twenty-eight million, twenty-eight thousand, six hundred sixteen".