686081390 has 16 divisors (see below), whose sum is σ = 1235628432. Its totient is φ = 274281024.

The previous prime is 686081369. The next prime is 686081399. The reversal of 686081390 is 93180686.

It is a happy number.

686081390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686081399) 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, 1082 + ... + 37058.

It is an arithmetic number, because the mean of its divisors is an integer number (77226777).

Almost surely, 2^686081390 is an apocalyptic number.

686081390 is a deficient number, since it is larger than the sum of its proper divisors (549547042).

686081390 is a wasteful number, since it uses less digits than its factorization.

686081390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37891.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 686081390 is about 26193.1554036546. The cubic root of 686081390 is about 881.9796127900.

The spelling of 686081390 in words is "six hundred eighty-six million, eighty-one thousand, three hundred ninety".