684244470 has 128 divisors (see below), whose sum is σ = 2030966784. Its totient is φ = 143668224.

The previous prime is 684244459. The next prime is 684244487. The reversal of 684244470 is 74442486.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 717514 + ... + 718466.

It is an arithmetic number, because the mean of its divisors is an integer number (15866928).

Almost surely, 2^684244470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684244470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015483392).

684244470 is an abundant number, since it is smaller than the sum of its proper divisors (1346722314).

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

684244470 is a wasteful number, since it uses less digits than its factorization.

684244470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246.

The product of its (nonzero) digits is 172032, while the sum is 39.

The square root of 684244470 is about 26158.0670157411. The cubic root of 684244470 is about 881.1917694032.

The spelling of 684244470 in words is "six hundred eighty-four million, two hundred forty-four thousand, four hundred seventy".