281828 has 6 divisors (see below), whose sum is σ = 493206. Its totient is φ = 140912.

The previous prime is 281807. The next prime is 281833. The reversal of 281828 is 828182.

It can be written as a sum of positive squares in only one way, i.e., 153664 + 128164 = 392^2 + 358^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 281828.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 281828.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35225 + ... + 35232.

It is an arithmetic number, because the mean of its divisors is an integer number (82201).

2²⁸¹⁸²⁸ is an apocalyptic number.

It is an amenable number.

281828 is a deficient number, since it is larger than the sum of its proper divisors (211378).

281828 is a wasteful number, since it uses less digits than its factorization.

281828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70461 (or 70459 counting only the distinct ones).

The product of its digits is 2048, while the sum is 29.

The square root of 281828 is about 530.8747498233. The cubic root of 281828 is about 65.5633867670.

It can be divided in two parts, 28182 and 8, that multiplied together give a triangular number (225456 = T₆₇₁).

The spelling of 281828 in words is "two hundred eighty-one thousand, eight hundred twenty-eight".