28541540 has 48 divisors (see below), whose sum is σ = 61650288. Its totient is φ = 11096064.

The previous prime is 28541533. The next prime is 28541561. The reversal of 28541540 is 4514582.

It can be written as a sum of positive squares in 8 ways, for example, as 430336 + 28111204 = 656^2 + 5302^2 .

It is an unprimeable number.

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, 164894 + ... + 165066.

It is an arithmetic number, because the mean of its divisors is an integer number (1284381).

Almost surely, 2^28541540 is an apocalyptic number.

28541540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28541540 is an abundant number, since it is smaller than the sum of its proper divisors (33108748).

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

28541540 is a wasteful number, since it uses less digits than its factorization.

28541540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 28541540 is about 5342.4282868374. The cubic root of 28541540 is about 305.6040702152.

The spelling of 28541540 in words is "twenty-eight million, five hundred forty-one thousand, five hundred forty".