28361755 has 4 divisors (see below), whose sum is σ = 34034112. Its totient is φ = 22689400.

The previous prime is 28361717. The next prime is 28361819. The reversal of 28361755 is 55716382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55716382 = 2 ⋅27858191.

It is a de Polignac number, because none of the positive numbers 2^k-28361755 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 2836171 + ... + 2836180.

It is an arithmetic number, because the mean of its divisors is an integer number (8508528).

Almost surely, 2^28361755 is an apocalyptic number.

28361755 is a deficient number, since it is larger than the sum of its proper divisors (5672357).

28361755 is an equidigital number, since it uses as much as digits as its factorization.

28361755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672356.

The product of its digits is 50400, while the sum is 37.

The square root of 28361755 is about 5325.5755557498. The cubic root of 28361755 is about 304.9610449218.

The spelling of 28361755 in words is "twenty-eight million, three hundred sixty-one thousand, seven hundred fifty-five".