684624398 has 12 divisors (see below), whose sum is σ = 1060382688. Its totient is φ = 331170180.

The previous prime is 684624389. The next prime is 684624439. The reversal of 684624398 is 893426486.

It is a happy number.

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 5 ways as a sum of consecutive naturals, for example, 204365 + ... + 207687.

It is an arithmetic number, because the mean of its divisors is an integer number (88365224).

Almost surely, 2^684624398 is an apocalyptic number.

684624398 is a deficient number, since it is larger than the sum of its proper divisors (375758290).

684624398 is an frugal number, since it uses more digits than its factorization.

684624398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6679 (or 3356 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 50.

The square root of 684624398 is about 26165.3281653412. The cubic root of 684624398 is about 881.3548336764.

The spelling of 684624398 in words is "six hundred eighty-four million, six hundred twenty-four thousand, three hundred ninety-eight".