640253411 has 8 divisors (see below), whose sum is σ = 747287040. Its totient is φ = 537112008.

The previous prime is 640253401. The next prime is 640253429. The reversal of 640253411 is 114352046.

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 640253411 - 2⁶ = 640253347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640253401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 972701 + ... + 973358.

It is an arithmetic number, because the mean of its divisors is an integer number (93410880).

Almost surely, 2^640253411 is an apocalyptic number.

640253411 is a deficient number, since it is larger than the sum of its proper divisors (107033629).

640253411 is a wasteful number, since it uses less digits than its factorization.

640253411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946113.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 640253411 is about 25303.2292603138. The cubic root of 640253411 is about 861.8876021392.

The spelling of 640253411 in words is "six hundred forty million, two hundred fifty-three thousand, four hundred eleven".