28555040 has 24 divisors (see below), whose sum is σ = 67461660. Its totient is φ = 11421952.

The previous prime is 28554979. The next prime is 28555049. The reversal of 28555040 is 4055582.

It can be written as a sum of positive squares in 2 ways, for example, as 23697424 + 4857616 = 4868^2 + 2204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28554994 and 28555012.

It is not an unprimeable number, because it can be changed into a prime (28555049) 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, 89075 + ... + 89394.

Almost surely, 2^28555040 is an apocalyptic number.

28555040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28555040 is an abundant number, since it is smaller than the sum of its proper divisors (38906620).

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

28555040 is a wasteful number, since it uses less digits than its factorization.

28555040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178484 (or 178476 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The square root of 28555040 is about 5343.6916078681. The cubic root of 28555040 is about 305.6522456658.

The spelling of 28555040 in words is "twenty-eight million, five hundred fifty-five thousand, forty".