858509690 has 32 divisors (see below), whose sum is σ = 1647248400. Its totient is φ = 321025024.

The previous prime is 858509683. The next prime is 858509719. The reversal of 858509690 is 96905858.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 423495241 + 435014449 = 20579^2 + 20857^2 .

It is a super-2 number, since 2×858509690² = 1474077775647792200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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 15 ways as a sum of consecutive naturals, for example, 8384 + ... + 42276.

Almost surely, 2^858509690 is an apocalyptic number.

858509690 is a deficient number, since it is larger than the sum of its proper divisors (788738710).

858509690 is a wasteful number, since it uses less digits than its factorization.

858509690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34066.

The product of its (nonzero) digits is 777600, while the sum is 50.

The square root of 858509690 is about 29300.3360048993. The cubic root of 858509690 is about 950.4189066669.

The spelling of 858509690 in words is "eight hundred fifty-eight million, five hundred nine thousand, six hundred ninety".