856866290 has 16 divisors (see below), whose sum is σ = 1762696512. Its totient is φ = 293782704.

The previous prime is 856866287. The next prime is 856866341. The reversal of 856866290 is 92668658.

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, 6120404 + ... + 6120543.

It is an arithmetic number, because the mean of its divisors is an integer number (110168532).

Almost surely, 2^856866290 is an apocalyptic number.

856866290 is an abundant number, since it is smaller than the sum of its proper divisors (905830222).

856866290 is a wasteful number, since it uses less digits than its factorization.

856866290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12240961.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 856866290 is about 29272.2785242283. The cubic root of 856866290 is about 949.8120736307.

The spelling of 856866290 in words is "eight hundred fifty-six million, eight hundred sixty-six thousand, two hundred ninety".