277228 has 12 divisors (see below), whose sum is σ = 554512. Its totient is φ = 118800.

The previous prime is 277223. The next prime is 277231. The reversal of 277228 is 822772.

277228 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

277228 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 9901 = 277228 / (2 + 7 + 7 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 277196 and 277205.

It is not an unprimeable number, because it can be changed into a prime (277223) by changing a digit.

277228 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4923 + ... + 4978.

2²⁷⁷²²⁸ is an apocalyptic number.

277228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

277228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

277228 is a wasteful number, since it uses less digits than its factorization.

277228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9912 (or 9910 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 277228 is about 526.5244533733. The cubic root of 277228 is about 65.2047194446.

It can be divided in two parts, 27722 and 8, that added together give a triangular number (27730 = T₂₃₅).

The spelling of 277228 in words is "two hundred seventy-seven thousand, two hundred twenty-eight".