687555401 has 8 divisors (see below), whose sum is σ = 741023304. Its totient is φ = 634170240.

The previous prime is 687555383. The next prime is 687555431. The reversal of 687555401 is 104555786.

687555401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 217533001 + 470022400 = 14749^2 + 21680^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687555401 - 2¹⁰ = 687554377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687555431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2846 + ... + 37191.

It is an arithmetic number, because the mean of its divisors is an integer number (92627913).

Almost surely, 2^687555401 is an apocalyptic number.

It is an amenable number.

687555401 is a deficient number, since it is larger than the sum of its proper divisors (53467903).

687555401 is a wasteful number, since it uses less digits than its factorization.

687555401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41371.

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 687555401 is about 26221.2776385896. The cubic root of 687555401 is about 882.6107904466.

The spelling of 687555401 in words is "six hundred eighty-seven million, five hundred fifty-five thousand, four hundred one".