28355560 has 32 divisors (see below), whose sum is σ = 64148040. Its totient is φ = 11280384.

The previous prime is 28355531. The next prime is 28355563. The reversal of 28355560 is 6555382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11985444 + 16370116 = 3462^2 + 4046^2 .

It is not an unprimeable number, because it can be changed into a prime (28355563) 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, 5884 + ... + 9556.

Almost surely, 2^28355560 is an apocalyptic number.

28355560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28355560 is an abundant number, since it is smaller than the sum of its proper divisors (35792480).

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

28355560 is a wasteful number, since it uses less digits than its factorization.

28355560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877 (or 3873 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 28355560 is about 5324.9938967101. The cubic root of 28355560 is about 304.9388392997.

The spelling of 28355560 in words is "twenty-eight million, three hundred fifty-five thousand, five hundred sixty".