684419220 has 72 divisors (see below), whose sum is σ = 2152978464. Its totient is φ = 182510496.

The previous prime is 684419179. The next prime is 684419237. The reversal of 684419220 is 22914486.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65554 + ... + 75273.

Almost surely, 2^684419220 is an apocalyptic number.

684419220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684419220 is an abundant number, since it is smaller than the sum of its proper divisors (1468559244).

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

684419220 is a wasteful number, since it uses less digits than its factorization.

684419220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140851 (or 140837 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 684419220 is about 26161.4070722505. The cubic root of 684419220 is about 881.2667792188.

It can be divided in two parts, 684 and 419220, that added together give a square (419904 = 648²).

The spelling of 684419220 in words is "six hundred eighty-four million, four hundred nineteen thousand, two hundred twenty".