684290920 has 16 divisors (see below), whose sum is σ = 1539654660. Its totient is φ = 273716352.

The previous prime is 684290891. The next prime is 684290933. The reversal of 684290920 is 29092486.

It can be written as a sum of positive squares in 2 ways, for example, as 662444644 + 21846276 = 25738^2 + 4674^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 17107273 = 684290920 / (6 + 8 + 4 + 2 + 9 + 0 + 9 + 2 + 0).

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, 8553597 + ... + 8553676.

Almost surely, 2^684290920 is an apocalyptic number.

It is an amenable number.

684290920 is an abundant number, since it is smaller than the sum of its proper divisors (855363740).

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

684290920 is a wasteful number, since it uses less digits than its factorization.

684290920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17107284 (or 17107280 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 684290920 is about 26158.9548720892. The cubic root of 684290920 is about 881.2117088806.

The spelling of 684290920 in words is "six hundred eighty-four million, two hundred ninety thousand, nine hundred twenty".