28507755 has 32 divisors (see below), whose sum is σ = 47628288. Its totient is φ = 14544000.

The previous prime is 28507747. The next prime is 28507757. The reversal of 28507755 is 55770582.

It is not a de Polignac number, because 28507755 - 2³ = 28507747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28507757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46662 + ... + 47268.

It is an arithmetic number, because the mean of its divisors is an integer number (1488384).

Almost surely, 2^28507755 is an apocalyptic number.

28507755 is a deficient number, since it is larger than the sum of its proper divisors (19120533).

28507755 is a wasteful number, since it uses less digits than its factorization.

28507755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747.

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 28507755 is about 5339.2653989102. The cubic root of 28507755 is about 305.4834400732.

The spelling of 28507755 in words is "twenty-eight million, five hundred seven thousand, seven hundred fifty-five".