684642424 has 16 divisors (see below), whose sum is σ = 1284837120. Its totient is φ = 342019200.

The previous prime is 684642401. The next prime is 684642433. The reversal of 684642424 is 424246486.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27969 + ... + 46384.

It is an arithmetic number, because the mean of its divisors is an integer number (80302320).

Almost surely, 2^684642424 is an apocalyptic number.

It is an amenable number.

684642424 is a deficient number, since it is larger than the sum of its proper divisors (600194696).

684642424 is a wasteful number, since it uses less digits than its factorization.

684642424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75510 (or 75506 counting only the distinct ones).

The product of its digits is 294912, while the sum is 40.

The square root of 684642424 is about 26165.6726265541. The cubic root of 684642424 is about 881.3625688973.

The spelling of 684642424 in words is "six hundred eighty-four million, six hundred forty-two thousand, four hundred twenty-four".