8640290 has 8 divisors (see below), whose sum is σ = 15552540. Its totient is φ = 3456112.

The previous prime is 8640287. The next prime is 8640329. The reversal of 8640290 is 920468.

It can be written as a sum of positive squares in 2 ways, for example, as 8288641 + 351649 = 2879^2 + 593^2 .

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

It is a super-2 number, since 2×8640290² = 149309222568200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432005 + ... + 432024.

Almost surely, 2^8640290 is an apocalyptic number.

8640290 is a deficient number, since it is larger than the sum of its proper divisors (6912250).

8640290 is a wasteful number, since it uses less digits than its factorization.

8640290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864036.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 8640290 is about 2939.4370209276. The cubic root of 8640290 is about 205.1994093766.

The spelling of 8640290 in words is "eight million, six hundred forty thousand, two hundred ninety".