28648820 has 12 divisors (see below), whose sum is σ = 60162564. Its totient is φ = 11459520.

The previous prime is 28648811. The next prime is 28648831. The reversal of 28648820 is 2884682.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 6615184 = 4694^2 + 2572^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 716201 + ... + 716240.

It is an arithmetic number, because the mean of its divisors is an integer number (5013547).

Almost surely, 2^28648820 is an apocalyptic number.

28648820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28648820 is an abundant number, since it is smaller than the sum of its proper divisors (31513744).

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

28648820 is a wasteful number, since it uses less digits than its factorization.

28648820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432450 (or 1432448 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 38.

The square root of 28648820 is about 5352.4592478598. The cubic root of 28648820 is about 305.9864860821.

The spelling of 28648820 in words is "twenty-eight million, six hundred forty-eight thousand, eight hundred twenty".