672818 has 8 divisors (see below), whose sum is σ = 1013148. Its totient is φ = 335104.

The previous prime is 672817. The next prime is 672823. The reversal of 672818 is 818276.

It can be written as a sum of positive squares in 2 ways, for example, as 667489 + 5329 = 817^2 + 73^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×672818² = 905368122248, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (672811) 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, 230 + ... + 1182.

2⁶⁷²⁸¹⁸ is an apocalyptic number.

672818 is a deficient number, since it is larger than the sum of its proper divisors (340330).

672818 is a wasteful number, since it uses less digits than its factorization.

672818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 5376, while the sum is 32.

The square root of 672818 is about 820.2548384496. The cubic root of 672818 is about 87.6259085323.

It can be divided in two parts, 6728 and 18, that multiplied together give a square (121104 = 348²).

The spelling of 672818 in words is "six hundred seventy-two thousand, eight hundred eighteen".