681291776 has 52 divisors (see below), whose sum is σ = 1486371624. Its totient is φ = 309657600.

The previous prime is 681291773. The next prime is 681291799. The reversal of 681291776 is 677192186.

It is a self number, because there is not a number n which added to its sum of digits gives 681291776.

It is not an unprimeable number, because it can be changed into a prime (681291773) 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, 37496 + ... + 52616.

Almost surely, 2^681291776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681291776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743185812).

681291776 is an abundant number, since it is smaller than the sum of its proper divisors (805079848).

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

681291776 is a wasteful number, since it uses less digits than its factorization.

681291776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15156 (or 15134 counting only the distinct ones).

The product of its digits is 254016, while the sum is 47.

The square root of 681291776 is about 26101.5665430257. The cubic root of 681291776 is about 879.9224174028.

The spelling of 681291776 in words is "six hundred eighty-one million, two hundred ninety-one thousand, seven hundred seventy-six".