28211040 has 288 divisors, whose sum is σ = 113926176. Its totient is φ = 6266880.

The previous prime is 28211039. The next prime is 28211059. The reversal of 28211040 is 4011282.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205852 + ... + 205988.

It is an arithmetic number, because the mean of its divisors is an integer number (395577).

Almost surely, 2^28211040 is an apocalyptic number.

28211040 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 28211040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56963088).

28211040 is an abundant number, since it is smaller than the sum of its proper divisors (85715136).

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

28211040 is a wasteful number, since it uses less digits than its factorization.

28211040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28211040 is about 5311.4065933611. The cubic root of 28211040 is about 304.4198952900.

The spelling of 28211040 in words is "twenty-eight million, two hundred eleven thousand, forty".