686555090 has 32 divisors (see below), whose sum is σ = 1349623296. Its totient is φ = 249923520.

The previous prime is 686554997. The next prime is 686555119. The reversal of 686555090 is 90555686.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27962 + ... + 46421.

It is an arithmetic number, because the mean of its divisors is an integer number (42175728).

Almost surely, 2^686555090 is an apocalyptic number.

686555090 is a deficient number, since it is larger than the sum of its proper divisors (663068206).

686555090 is a wasteful number, since it uses less digits than its factorization.

686555090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74474.

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 686555090 is about 26202.1962819913. The cubic root of 686555090 is about 882.1825516013.

The spelling of 686555090 in words is "six hundred eighty-six million, five hundred fifty-five thousand, ninety".