640032023727 has 6 divisors (see below), whose sum is σ = 924490700952. Its totient is φ = 426688015812.

The previous prime is 640032023723. The next prime is 640032023759. The reversal of 640032023727 is 727320230046.

640032023727 is a `hidden beast` number, since 640 + 0 + 3 + 2 + 0 + 2 + 3 + 7 + 2 + 7 = 666.

It is not a de Polignac number, because 640032023727 - 2² = 640032023723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640032023691 and 640032023700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640032023723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35557334643 + ... + 35557334660.

It is an arithmetic number, because the mean of its divisors is an integer number (154081783492).

Almost surely, 2^640032023727 is an apocalyptic number.

640032023727 is a deficient number, since it is larger than the sum of its proper divisors (284458677225).

640032023727 is a wasteful number, since it uses less digits than its factorization.

640032023727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71114669309 (or 71114669306 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 36.

The spelling of 640032023727 in words is "six hundred forty billion, thirty-two million, twenty-three thousand, seven hundred twenty-seven".