640085349 has 8 divisors (see below), whose sum is σ = 853584480. Its totient is φ = 426654896.

The previous prime is 640085333. The next prime is 640085351. The reversal of 640085349 is 943580046.

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

It is a cyclic number.

It is not a de Polignac number, because 640085349 - 2⁴ = 640085333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640085359) 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, 11347 + ... + 37535.

It is an arithmetic number, because the mean of its divisors is an integer number (106698060).

Almost surely, 2^640085349 is an apocalyptic number.

It is an amenable number.

640085349 is a deficient number, since it is larger than the sum of its proper divisors (213499131).

640085349 is a wasteful number, since it uses less digits than its factorization.

640085349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34339.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 640085349 is about 25299.9080828370. The cubic root of 640085349 is about 861.8121824030.

The spelling of 640085349 in words is "six hundred forty million, eighty-five thousand, three hundred forty-nine".