640089337 has 2 divisors, whose sum is σ = 640089338. Its totient is φ = 640089336.

The previous prime is 640089319. The next prime is 640089341. The reversal of 640089337 is 733980046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638118121 + 1971216 = 25261^2 + 1404^2 .

It is a cyclic number.

It is not a de Polignac number, because 640089337 - 2¹⁵ = 640056569 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 640089337.

It is not a weakly prime, because it can be changed into another prime (640089367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320044668 + 320044669.

It is an arithmetic number, because the mean of its divisors is an integer number (320044669).

Almost surely, 2^640089337 is an apocalyptic number.

It is an amenable number.

640089337 is a deficient number, since it is larger than the sum of its proper divisors (1).

640089337 is an equidigital number, since it uses as much as digits as its factorization.

640089337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 640089337 is about 25299.9868972298. The cubic root of 640089337 is about 861.8139722163.

The spelling of 640089337 in words is "six hundred forty million, eighty-nine thousand, three hundred thirty-seven".