640335361 has 8 divisors (see below), whose sum is σ = 652628864. Its totient is φ = 628099920.

The previous prime is 640335329. The next prime is 640335389. The reversal of 640335361 is 163533046.

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

It is not a de Polignac number, because 640335361 - 2⁵ = 640335329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640335161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8086 + ... + 36688.

It is an arithmetic number, because the mean of its divisors is an integer number (81578608).

Almost surely, 2^640335361 is an apocalyptic number.

640335361 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

640335361 is a deficient number, since it is larger than the sum of its proper divisors (12293503).

640335361 is a wasteful number, since it uses less digits than its factorization.

640335361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29031.

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 640335361 is about 25304.8485670237. The cubic root of 640335361 is about 861.9243733481.

The spelling of 640335361 in words is "six hundred forty million, three hundred thirty-five thousand, three hundred sixty-one".