640579111 has 8 divisors (see below), whose sum is σ = 650083104. Its totient is φ = 631088640.

The previous prime is 640579109. The next prime is 640579153. The reversal of 640579111 is 111975046.

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 640579111 - 2¹ = 640579109 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 (640579171) 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, 130575 + ... + 135391.

It is an arithmetic number, because the mean of its divisors is an integer number (81260388).

Almost surely, 2^640579111 is an apocalyptic number.

640579111 is a deficient number, since it is larger than the sum of its proper divisors (9503993).

640579111 is a wasteful number, since it uses less digits than its factorization.

640579111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6761.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 640579111 is about 25309.6643794421. The cubic root of 640579111 is about 862.0337261582.

The spelling of 640579111 in words is "six hundred forty million, five hundred seventy-nine thousand, one hundred eleven".