28755775 has 12 divisors (see below), whose sum is σ = 36417312. Its totient is φ = 22514240.

The previous prime is 28755761. The next prime is 28755799. The reversal of 28755775 is 57755782.

It is not a de Polignac number, because 28755775 - 2⁵ = 28755743 is a prime.

It is a super-3 number, since 3×28755775³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 11062 + ... + 13411.

It is an arithmetic number, because the mean of its divisors is an integer number (3034776).

Almost surely, 2^28755775 is an apocalyptic number.

28755775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28755775 is a deficient number, since it is larger than the sum of its proper divisors (7661537).

28755775 is a wasteful number, since it uses less digits than its factorization.

28755775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24530 (or 24525 counting only the distinct ones).

The product of its digits is 686000, while the sum is 46.

The square root of 28755775 is about 5362.4411418681. The cubic root of 28755775 is about 306.3667942698.

The spelling of 28755775 in words is "twenty-eight million, seven hundred fifty-five thousand, seven hundred seventy-five".