684421628 has 12 divisors (see below), whose sum is σ = 1306623192. Its totient is φ = 311100720.

The previous prime is 684421613. The next prime is 684421643. The reversal of 684421628 is 826124486.

It is an interprime number because it is at equal distance from previous prime (684421613) and next prime (684421643).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7777475 + ... + 7777562.

It is an arithmetic number, because the mean of its divisors is an integer number (108885266).

Almost surely, 2^684421628 is an apocalyptic number.

It is an amenable number.

684421628 is a deficient number, since it is larger than the sum of its proper divisors (622201564).

684421628 is a wasteful number, since it uses less digits than its factorization.

684421628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15555052 (or 15555050 counting only the distinct ones).

The product of its digits is 147456, while the sum is 41.

The square root of 684421628 is about 26161.4530941995. The cubic root of 684421628 is about 881.2678127412.

The spelling of 684421628 in words is "six hundred eighty-four million, four hundred twenty-one thousand, six hundred twenty-eight".