28621120 has 112 divisors (see below), whose sum is σ = 76370688. Its totient is φ = 10127360.

The previous prime is 28621097. The next prime is 28621121. The reversal of 28621120 is 2112682.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 28621091 and 28621100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28621121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165354 + ... + 165526.

Almost surely, 2^28621120 is an apocalyptic number.

28621120 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 28621120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38185344).

28621120 is an abundant number, since it is smaller than the sum of its proper divisors (47749568).

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

28621120 is a wasteful number, since it uses less digits than its factorization.

28621120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 28621120 is about 5349.8710264828. The cubic root of 28621120 is about 305.8878367737.

The spelling of 28621120 in words is "twenty-eight million, six hundred twenty-one thousand, one hundred twenty".