681799628 has 12 divisors (see below), whose sum is σ = 1234292640. Its totient is φ = 329144592.

The previous prime is 681799621. The next prime is 681799663. The reversal of 681799628 is 826997186.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (681799621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2938676 + ... + 2938907.

It is an arithmetic number, because the mean of its divisors is an integer number (102857720).

Almost surely, 2^681799628 is an apocalyptic number.

It is an amenable number.

681799628 is a deficient number, since it is larger than the sum of its proper divisors (552493012).

681799628 is a wasteful number, since it uses less digits than its factorization.

681799628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5877616 (or 5877614 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 56.

The square root of 681799628 is about 26111.2931123681. The cubic root of 681799628 is about 880.1410018552.

The spelling of 681799628 in words is "six hundred eighty-one million, seven hundred ninety-nine thousand, six hundred twenty-eight".