28620775 has 12 divisors (see below), whose sum is σ = 37577952. Its totient is φ = 21549440.

The previous prime is 28620737. The next prime is 28620797. The reversal of 28620775 is 57702682.

It is not a de Polignac number, because 28620775 - 2¹³ = 28612583 is a prime.

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, 33247 + ... + 34096.

It is an arithmetic number, because the mean of its divisors is an integer number (3131496).

Almost surely, 2^28620775 is an apocalyptic number.

28620775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28620775 is a deficient number, since it is larger than the sum of its proper divisors (8957177).

28620775 is a wasteful number, since it uses less digits than its factorization.

28620775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67370 (or 67365 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28620775 is about 5349.8387826177. The cubic root of 28620775 is about 305.8866077078.

The spelling of 28620775 in words is "twenty-eight million, six hundred twenty thousand, seven hundred seventy-five".