277998 has 16 divisors (see below), whose sum is σ = 635520. Its totient is φ = 79416.

The previous prime is 277993. The next prime is 277999. The reversal of 277998 is 899772.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 6619 = 277998 / (2 + 7 + 7 + 9 + 9 + 8).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 277998.

It is not an unprimeable number, because it can be changed into a prime (277993) by changing a digit.

277998 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 7 ways as a sum of consecutive naturals, for example, 3268 + ... + 3351.

It is an arithmetic number, because the mean of its divisors is an integer number (39720).

2²⁷⁷⁹⁹⁸ is an apocalyptic number.

277998 is an abundant number, since it is smaller than the sum of its proper divisors (357522).

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

277998 is a wasteful number, since it uses less digits than its factorization.

277998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6631.

The product of its digits is 63504, while the sum is 42.

The square root of 277998 is about 527.2551564470. The cubic root of 277998 is about 65.2650322818.

It can be divided in two parts, 277 and 998, that added together give a triangular number (1275 = T₅₀).

The spelling of 277998 in words is "two hundred seventy-seven thousand, nine hundred ninety-eight".