681784328 has 16 divisors (see below), whose sum is σ = 1286813760. Its totient is φ = 338634000.

The previous prime is 681784309. The next prime is 681784339. The reversal of 681784328 is 823487186.

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, 280988 + ... + 283403.

It is an arithmetic number, because the mean of its divisors is an integer number (80425860).

Almost surely, 2^681784328 is an apocalyptic number.

It is an amenable number.

681784328 is a deficient number, since it is larger than the sum of its proper divisors (605029432).

681784328 is a wasteful number, since it uses less digits than its factorization.

681784328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564548 (or 564544 counting only the distinct ones).

The product of its digits is 516096, while the sum is 47.

The square root of 681784328 is about 26111.0001340431. Note that the first 3 decimals coincide. The cubic root of 681784328 is about 880.1344181721.

The spelling of 681784328 in words is "six hundred eighty-one million, seven hundred eighty-four thousand, three hundred twenty-eight".