28648220 has 12 divisors (see below), whose sum is σ = 60161304. Its totient is φ = 11459280.

The previous prime is 28648199. The next prime is 28648237. The reversal of 28648220 is 2284682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716186 + ... + 716225.

It is an arithmetic number, because the mean of its divisors is an integer number (5013442).

Almost surely, 2^28648220 is an apocalyptic number.

28648220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28648220 is an abundant number, since it is smaller than the sum of its proper divisors (31513084).

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

28648220 is a wasteful number, since it uses less digits than its factorization.

28648220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432420 (or 1432418 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 28648220 is about 5352.4031985642. The cubic root of 28648220 is about 305.9843499479.

The spelling of 28648220 in words is "twenty-eight million, six hundred forty-eight thousand, two hundred twenty".