686108026 has 8 divisors (see below), whose sum is σ = 1031138964. Its totient is φ = 342395040.

The previous prime is 686108023. The next prime is 686108047. The reversal of 686108026 is 620801686.

It can be written as a sum of positive squares in 2 ways, for example, as 646430625 + 39677401 = 25425^2 + 6299^2 .

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

It is not an unprimeable number, because it can be changed into a prime (686108023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328185 + ... + 330268.

Almost surely, 2^686108026 is an apocalyptic number.

686108026 is a deficient number, since it is larger than the sum of its proper divisors (345030938).

686108026 is a wasteful number, since it uses less digits than its factorization.

686108026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658976.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 686108026 is about 26193.6638521609. The cubic root of 686108026 is about 881.9910264529.

It can be divided in two parts, 68610 and 8026, that added together give a triangular number (76636 = T₃₉₁).

The spelling of 686108026 in words is "six hundred eighty-six million, one hundred eight thousand, twenty-six".