684800538 has 16 divisors (see below), whose sum is σ = 1388892096. Its totient is φ = 225051680.

The previous prime is 684800537. The next prime is 684800549. The reversal of 684800538 is 835008486.

It is a self number, because there is not a number n which added to its sum of digits gives 684800538.

It is not an unprimeable number, because it can be changed into a prime (684800537) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 803331 + ... + 804182.

It is an arithmetic number, because the mean of its divisors is an integer number (86805756).

Almost surely, 2^684800538 is an apocalyptic number.

684800538 is an abundant number, since it is smaller than the sum of its proper divisors (704091558).

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

684800538 is a wasteful number, since it uses less digits than its factorization.

684800538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1607589.

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 684800538 is about 26168.6938535342. The cubic root of 684800538 is about 881.4304121148.

The spelling of 684800538 in words is "six hundred eighty-four million, eight hundred thousand, five hundred thirty-eight".