686961055 has 64 divisors (see below), whose sum is σ = 987148800. Its totient is φ = 453496320.

The previous prime is 686961049. The next prime is 686961059. The reversal of 686961055 is 550169686.

It is not a de Polignac number, because 686961055 - 2²¹ = 684863903 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 686960996 and 686961014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686961059) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4214404 + ... + 4214566.

It is an arithmetic number, because the mean of its divisors is an integer number (15424200).

Almost surely, 2^686961055 is an apocalyptic number.

686961055 is a deficient number, since it is larger than the sum of its proper divisors (300187745).

686961055 is a wasteful number, since it uses less digits than its factorization.

686961055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 388800, while the sum is 46.

The square root of 686961055 is about 26209.9419114198. The cubic root of 686961055 is about 882.3563976523.

It can be divided in two parts, 68696 and 1055, that added together give a triangular number (69751 = T₃₇₃).

The spelling of 686961055 in words is "six hundred eighty-six million, nine hundred sixty-one thousand, fifty-five".