686997290 has 16 divisors (see below), whose sum is σ = 1413251712. Its totient is φ = 235541904.

The previous prime is 686997287. The next prime is 686997313. The reversal of 686997290 is 92799686.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4907054 + ... + 4907193.

It is an arithmetic number, because the mean of its divisors is an integer number (88328232).

Almost surely, 2^686997290 is an apocalyptic number.

686997290 is an abundant number, since it is smaller than the sum of its proper divisors (726254422).

686997290 is a wasteful number, since it uses less digits than its factorization.

686997290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9814261.

The product of its (nonzero) digits is 2939328, while the sum is 56.

The square root of 686997290 is about 26210.6331476369. The cubic root of 686997290 is about 882.3719112061.

The spelling of 686997290 in words is "six hundred eighty-six million, nine hundred ninety-seven thousand, two hundred ninety".