681494560 has 48 divisors (see below), whose sum is σ = 1615637016. Its totient is φ = 271648768.

The previous prime is 681494557. The next prime is 681494563. The reversal of 681494560 is 65494186.

It is an interprime number because it is at equal distance from previous prime (681494557) and next prime (681494563).

It can be written as a sum of positive squares in 4 ways, for example, as 611671824 + 69822736 = 24732^2 + 8356^2 .

It is not an unprimeable number, because it can be changed into a prime (681494563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39612 + ... + 54148.

Almost surely, 2^681494560 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 681494560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807818508).

681494560 is an abundant number, since it is smaller than the sum of its proper divisors (934142456).

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

681494560 is a wasteful number, since it uses less digits than its factorization.

681494560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14845 (or 14837 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 681494560 is about 26105.4507718216. The cubic root of 681494560 is about 880.0097106366.

The spelling of 681494560 in words is "six hundred eighty-one million, four hundred ninety-four thousand, five hundred sixty".