640041277 has 8 divisors (see below), whose sum is σ = 673992000. Its totient is φ = 606117024.

The previous prime is 640041257. The next prime is 640041299. The reversal of 640041277 is 772140046.

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

It is not a de Polignac number, because 640041277 - 2¹¹ = 640039229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640041257) 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, 60648 + ... + 70414.

It is an arithmetic number, because the mean of its divisors is an integer number (84249000).

Almost surely, 2^640041277 is an apocalyptic number.

It is an amenable number.

640041277 is a deficient number, since it is larger than the sum of its proper divisors (33950723).

640041277 is a wasteful number, since it uses less digits than its factorization.

640041277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13235.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 640041277 is about 25299.0370765371. The cubic root of 640041277 is about 861.7924024063.

The spelling of 640041277 in words is "six hundred forty million, forty-one thousand, two hundred seventy-seven".