28663120 has 20 divisors (see below), whose sum is σ = 66641940. Its totient is φ = 11465216.

The previous prime is 28663111. The next prime is 28663121. The reversal of 28663120 is 2136682.

It can be written as a sum of positive squares in 2 ways, for example, as 4613904 + 24049216 = 2148^2 + 4904^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663121) 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 3 ways as a sum of consecutive naturals, for example, 179065 + ... + 179224.

It is an arithmetic number, because the mean of its divisors is an integer number (3332097).

Almost surely, 2^28663120 is an apocalyptic number.

28663120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28663120 is an abundant number, since it is smaller than the sum of its proper divisors (37978820).

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

28663120 is a wasteful number, since it uses less digits than its factorization.

28663120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358302 (or 358296 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28663120 is about 5353.7949157584. The cubic root of 28663120 is about 306.0373884570.

The spelling of 28663120 in words is "twenty-eight million, six hundred sixty-three thousand, one hundred twenty".