673221820 has 12 divisors (see below), whose sum is σ = 1413765864. Its totient is φ = 269288720.

The previous prime is 673221817. The next prime is 673221821. The reversal of 673221820 is 28122376.

It is a super-2 number, since 2×673221820² = 906455237848224800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (673221821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16830526 + ... + 16830565.

It is an arithmetic number, because the mean of its divisors is an integer number (117813822).

Almost surely, 2^673221820 is an apocalyptic number.

It is an amenable number.

673221820 is an abundant number, since it is smaller than the sum of its proper divisors (740544044).

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

673221820 is a wasteful number, since it uses less digits than its factorization.

673221820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33661100 (or 33661098 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 673221820 is about 25946.5184562399. The cubic root of 673221820 is about 876.4343581682.

It can be divided in two parts, 673221 and 820, that added together give a square (674041 = 821²).

The spelling of 673221820 in words is "six hundred seventy-three million, two hundred twenty-one thousand, eight hundred twenty".