681487308 has 18 divisors (see below), whose sum is σ = 1722648564. Its totient is φ = 227162424.

The previous prime is 681487297. The next prime is 681487319. The reversal of 681487308 is 803784186.

It is an interprime number because it is at equal distance from previous prime (681487297) and next prime (681487319).

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9465066 + ... + 9465137.

It is an arithmetic number, because the mean of its divisors is an integer number (95702698).

Almost surely, 2^681487308 is an apocalyptic number.

It is an amenable number.

681487308 is an abundant number, since it is smaller than the sum of its proper divisors (1041161256).

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

681487308 is a wasteful number, since it uses less digits than its factorization.

681487308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18930213 (or 18930208 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 681487308 is about 26105.3118732568. The cubic root of 681487308 is about 880.0065891380.

The spelling of 681487308 in words is "six hundred eighty-one million, four hundred eighty-seven thousand, three hundred eight".