684646242 has 16 divisors (see below), whose sum is σ = 1564905792. Its totient is φ = 195613200.

The previous prime is 684646211. The next prime is 684646243. The reversal of 684646242 is 242646486.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 16301101 = 684646242 / (6 + 8 + 4 + 6 + 4 + 6 + 2 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 684646194 and 684646203.

It is not an unprimeable number, because it can be changed into a prime (684646243) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8150509 + ... + 8150592.

It is an arithmetic number, because the mean of its divisors is an integer number (97806612).

Almost surely, 2^684646242 is an apocalyptic number.

684646242 is an abundant number, since it is smaller than the sum of its proper divisors (880259550).

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

684646242 is a wasteful number, since it uses less digits than its factorization.

684646242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16301113.

The product of its digits is 442368, while the sum is 42.

The square root of 684646242 is about 26165.7455846379. The cubic root of 684646242 is about 881.3642072396.

The spelling of 684646242 in words is "six hundred eighty-four million, six hundred forty-six thousand, two hundred forty-two".