28210266 has 48 divisors (see below), whose sum is σ = 70833984. Its totient is φ = 7947072.

The previous prime is 28210261. The next prime is 28210267. The reversal of 28210266 is 66201282.

It is not an unprimeable number, because it can be changed into a prime (28210261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7665 + ... + 10731.

It is an arithmetic number, because the mean of its divisors is an integer number (1475708).

Almost surely, 2^28210266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28210266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35416992).

28210266 is an abundant number, since it is smaller than the sum of its proper divisors (42623718).

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

28210266 is a wasteful number, since it uses less digits than its factorization.

28210266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155 (or 3152 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28210266 is about 5311.3337308062. Note that the first 3 decimals coincide. The cubic root of 28210266 is about 304.4171112363.

The spelling of 28210266 in words is "twenty-eight million, two hundred ten thousand, two hundred sixty-six".