681709480 has 16 divisors (see below), whose sum is σ = 1533846420. Its totient is φ = 272683776.

The previous prime is 681709433. The next prime is 681709481. The reversal of 681709480 is 84907186.

It can be written as a sum of positive squares in 2 ways, for example, as 662856516 + 18852964 = 25746^2 + 4342^2 .

It is not an unprimeable number, because it can be changed into a prime (681709481) 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, 8521329 + ... + 8521408.

Almost surely, 2^681709480 is an apocalyptic number.

It is an amenable number.

681709480 is an abundant number, since it is smaller than the sum of its proper divisors (852136940).

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

681709480 is a wasteful number, since it uses less digits than its factorization.

681709480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17042748 (or 17042744 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 681709480 is about 26109.5668290380. The cubic root of 681709480 is about 880.1022092026.

The spelling of 681709480 in words is "six hundred eighty-one million, seven hundred nine thousand, four hundred eighty".