687380081 has 16 divisors (see below), whose sum is σ = 748339200. Its totient is φ = 628981200.

The previous prime is 687380077. The next prime is 687380153. The reversal of 687380081 is 180083786.

687380081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 687380081 - 2² = 687380077 is a prime.

It is a super-2 number, since 2×687380081² = 944982751511133122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687389081) 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, 476960 + ... + 478398.

It is an arithmetic number, because the mean of its divisors is an integer number (46771200).

Almost surely, 2^687380081 is an apocalyptic number.

It is an amenable number.

687380081 is a deficient number, since it is larger than the sum of its proper divisors (60959119).

687380081 is a wasteful number, since it uses less digits than its factorization.

687380081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 687380081 is about 26217.9343389215. The cubic root of 687380081 is about 882.5357649880.

The spelling of 687380081 in words is "six hundred eighty-seven million, three hundred eighty thousand, eighty-one".