8491690 has 16 divisors (see below), whose sum is σ = 15339528. Its totient is φ = 3384576.

The previous prime is 8491673. The next prime is 8491697. The reversal of 8491690 is 961948.

It can be written as a sum of positive squares in 4 ways, for example, as 6671889 + 1819801 = 2583^2 + 1349^2 .

It is a super-2 number, since 2×8491690² = 144217598112200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8491697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1774 + ... + 4486.

Almost surely, 2^8491690 is an apocalyptic number.

8491690 is a deficient number, since it is larger than the sum of its proper divisors (6847838).

8491690 is a wasteful number, since it uses less digits than its factorization.

8491690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 8491690 is about 2914.0504456855. The cubic root of 8491690 is about 204.0162264422.

The spelling of 8491690 in words is "eight million, four hundred ninety-one thousand, six hundred ninety".