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28777 = 74111
BaseRepresentation
bin111000001101001
31110110211
413001221
51410102
6341121
7146620
oct70151
943424
1028777
111a691
12147a1
1310138
14a6b7
1587d7
hex7069

28777 has 4 divisors (see below), whose sum is σ = 32896. Its totient is φ = 24660.

The previous prime is 28771. The next prime is 28789. The reversal of 28777 is 77782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77782 = 238891.

It is a cyclic number.

It is not a de Polignac number, because 28777 - 27 = 28649 is a prime.

It is a Duffinian number.

28777 is a modest number, since divided by 777 gives 28 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2049 + ... + 2062.

It is an arithmetic number, because the mean of its divisors is an integer number (8224).

228777 is an apocalyptic number.

It is an amenable number.

28777 is a deficient number, since it is larger than the sum of its proper divisors (4119).

28777 is an equidigital number, since it uses as much as digits as its factorization.

28777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4118.

The product of its digits is 5488, while the sum is 31.

The square root of 28777 is about 169.6378495502. The cubic root of 28777 is about 30.6442153463.

The spelling of 28777 in words is "twenty-eight thousand, seven hundred seventy-seven".

Divisors: 1 7 4111 28777