681522688 has 160 divisors (see below), whose sum is σ = 1732389120. Its totient is φ = 260136960.

The previous prime is 681522659. The next prime is 681522689. The reversal of 681522688 is 886225186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681522689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2325870 + ... + 2326162.

It is an arithmetic number, because the mean of its divisors is an integer number (10827432).

Almost surely, 2^681522688 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 681522688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (866194560).

681522688 is an abundant number, since it is smaller than the sum of its proper divisors (1050866432).

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

681522688 is a wasteful number, since it uses less digits than its factorization.

681522688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 372 counting only the distinct ones).

The product of its digits is 368640, while the sum is 46.

The square root of 681522688 is about 26105.9895043264. The cubic root of 681522688 is about 880.0218176409.

It can be divided in two parts, 68 and 1522688, that added together give a square (1522756 = 1234²).

The spelling of 681522688 in words is "six hundred eighty-one million, five hundred twenty-two thousand, six hundred eighty-eight".