28450220 has 24 divisors (see below), whose sum is σ = 62890800. Its totient is φ = 10780992.

The previous prime is 28450193. The next prime is 28450223. The reversal of 28450220 is 2205482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28450223) 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 7 ways as a sum of consecutive naturals, for example, 37055 + ... + 37814.

It is an arithmetic number, because the mean of its divisors is an integer number (2620450).

Almost surely, 2^28450220 is an apocalyptic number.

28450220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28450220 is an abundant number, since it is smaller than the sum of its proper divisors (34440580).

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

28450220 is a wasteful number, since it uses less digits than its factorization.

28450220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74897 (or 74895 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 28450220 is about 5333.8747641841. The cubic root of 28450220 is about 305.2777904516.

The spelling of 28450220 in words is "twenty-eight million, four hundred fifty thousand, two hundred twenty".