684655472 has 10 divisors (see below), whose sum is σ = 1326520008. Its totient is φ = 342327728.

The previous prime is 684655457. The next prime is 684655493. The reversal of 684655472 is 274556486.

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 as a sum of consecutive naturals, namely, 21395468 + ... + 21395499.

Almost surely, 2^684655472 is an apocalyptic number.

It is an amenable number.

684655472 is a deficient number, since it is larger than the sum of its proper divisors (641864536).

684655472 is a wasteful number, since it uses less digits than its factorization.

684655472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42790975 (or 42790969 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 47.

The square root of 684655472 is about 26165.9219596788. The cubic root of 684655472 is about 881.3681679006.

It can be divided in two parts, 68465 and 5472, that added together give a palindrome (73937).

The spelling of 684655472 in words is "six hundred eighty-four million, six hundred fifty-five thousand, four hundred seventy-two".