640787407079 has 8 divisors (see below), whose sum is σ = 687069149760. Its totient is φ = 595459927296.

The previous prime is 640787407033. The next prime is 640787407097. The reversal of 640787407079 is 970704787046.

It is a happy number.

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 640787407079 - 2²⁸ = 640518971623 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 (640787407279) 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, 238564334 + ... + 238567019.

It is an arithmetic number, because the mean of its divisors is an integer number (85883643720).

Almost surely, 2^640787407079 is an apocalyptic number.

640787407079 is a deficient number, since it is larger than the sum of its proper divisors (46281742681).

640787407079 is a wasteful number, since it uses less digits than its factorization.

640787407079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477131449.

The product of its (nonzero) digits is 16595712, while the sum is 59.

The spelling of 640787407079 in words is "six hundred forty billion, seven hundred eighty-seven million, four hundred seven thousand, seventy-nine".