28813775 has 12 divisors (see below), whose sum is σ = 36601824. Its totient is φ = 22488000.

The previous prime is 28813751. The next prime is 28813781. The reversal of 28813775 is 57731882.

28813775 = T₁₁₆₅ + T₁₁₆₆ + ... + T₁₂₀₅.

It is a de Polignac number, because none of the positive numbers 2^k-28813775 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

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, 13031 + ... + 15080.

It is an arithmetic number, because the mean of its divisors is an integer number (3050152).

Almost surely, 2^28813775 is an apocalyptic number.

28813775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28813775 is a deficient number, since it is larger than the sum of its proper divisors (7788049).

28813775 is a wasteful number, since it uses less digits than its factorization.

28813775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28162 (or 28157 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 28813775 is about 5367.8464024225. The cubic root of 28813775 is about 306.5726351330.

The spelling of 28813775 in words is "twenty-eight million, eight hundred thirteen thousand, seven hundred seventy-five".