681742698 has 64 divisors (see below), whose sum is σ = 1682214912. Its totient is φ = 179363520.

The previous prime is 681742697. The next prime is 681742703. The reversal of 681742698 is 896247186.

It is a self number, because there is not a number n which added to its sum of digits gives 681742698.

It is not an unprimeable number, because it can be changed into a prime (681742697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 266815 + ... + 269357.

It is an arithmetic number, because the mean of its divisors is an integer number (26284608).

Almost surely, 2^681742698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681742698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (841107456).

681742698 is an abundant number, since it is smaller than the sum of its proper divisors (1000472214).

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

681742698 is a wasteful number, since it uses less digits than its factorization.

681742698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3059.

The product of its digits is 1161216, while the sum is 51.

The square root of 681742698 is about 26110.2029482729. The cubic root of 681742698 is about 880.1165040312.

The spelling of 681742698 in words is "six hundred eighty-one million, seven hundred forty-two thousand, six hundred ninety-eight".