28620816 has 80 divisors (see below), whose sum is σ = 85423104. Its totient is φ = 8088192.

The previous prime is 28620811. The next prime is 28620817. The reversal of 28620816 is 61802682.

28620816 = T₂₉₄ + T₂₉₅ + ... + T₅₈₁.

It is a super-2 number, since 2×28620816² = 1638302217011712, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28620811) 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, 34195 + ... + 35021.

Almost surely, 2^28620816 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 28620816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42711552).

28620816 is an abundant number, since it is smaller than the sum of its proper divisors (56802288).

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

28620816 is a wasteful number, since it uses less digits than its factorization.

28620816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948 (or 942 counting only the distinct ones).

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

The square root of 28620816 is about 5349.8426145075. The cubic root of 28620816 is about 305.8867537712.

The spelling of 28620816 in words is "twenty-eight million, six hundred twenty thousand, eight hundred sixteen".