849581690 has 8 divisors (see below), whose sum is σ = 1529247060. Its totient is φ = 339832672.

The previous prime is 849581687. The next prime is 849581701. The reversal of 849581690 is 96185948.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 840826009 + 8755681 = 28997^2 + 2959^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×849581690² = 1443578095966512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42479075 + ... + 42479094.

Almost surely, 2^849581690 is an apocalyptic number.

849581690 is a deficient number, since it is larger than the sum of its proper divisors (679665370).

849581690 is a wasteful number, since it uses less digits than its factorization.

849581690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84958176.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 849581690 is about 29147.5846340653. The cubic root of 849581690 is about 947.1128188344.

The spelling of 849581690 in words is "eight hundred forty-nine million, five hundred eighty-one thousand, six hundred ninety".