28268620 has 96 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 9891840.

The previous prime is 28268609. The next prime is 28268623. The reversal of 28268620 is 2686282.

It is a super-2 number, since 2×28268620² = 1598229753408800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (28268623) 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 31 ways as a sum of consecutive naturals, for example, 463390 + ... + 463450.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^28268620 is an apocalyptic number.

28268620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28268620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

28268620 is an abundant number, since it is smaller than the sum of its proper divisors (39227060).

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

28268620 is a wasteful number, since it uses less digits than its factorization.

28268620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 28268620 is about 5316.8242400892. The cubic root of 28268620 is about 304.6268661023.

It can be divided in two parts, 28268 and 620, that multiplied together give a triangular number (17526160 = T₅₉₂₀).

The spelling of 28268620 in words is "twenty-eight million, two hundred sixty-eight thousand, six hundred twenty".