686961054 has 64 divisors (see below), whose sum is σ = 1697095680. Its totient is φ = 204547680.

The previous prime is 686961049. The next prime is 686961059. The reversal of 686961054 is 450169686.

686961054 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (686961049) and next prime (686961059).

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 31 ways as a sum of consecutive naturals, for example, 5979 + ... + 37545.

It is an arithmetic number, because the mean of its divisors is an integer number (26517120).

Almost surely, 2^686961054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686961054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (848547840).

686961054 is an abundant number, since it is smaller than the sum of its proper divisors (1010134626).

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

686961054 is a wasteful number, since it uses less digits than its factorization.

686961054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31622 (or 31616 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 686961054 is about 26209.9418923431. The cubic root of 686961054 is about 882.3563972241.

The spelling of 686961054 in words is "six hundred eighty-six million, nine hundred sixty-one thousand, fifty-four".