7640289 has 6 divisors (see below), whose sum is σ = 11035986. Its totient is φ = 5093520.

The previous prime is 7640287. The next prime is 7640329. The reversal of 7640289 is 9820467.

7640289 is a `hidden beast` number, since 7 + 640 + 2 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5253264 + 2387025 = 2292^2 + 1545^2 .

It is not a de Polignac number, because 7640289 - 2¹ = 7640287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7640287) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 424452 + ... + 424469.

It is an arithmetic number, because the mean of its divisors is an integer number (1839331).

Almost surely, 2^7640289 is an apocalyptic number.

It is an amenable number.

7640289 is a deficient number, since it is larger than the sum of its proper divisors (3395697).

7640289 is a wasteful number, since it uses less digits than its factorization.

7640289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848927 (or 848924 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 7640289 is about 2764.1072699879. The cubic root of 7640289 is about 196.9563234702.

The spelling of 7640289 in words is "seven million, six hundred forty thousand, two hundred eighty-nine".