640523127 has 12 divisors (see below), whose sum is σ = 907224296. Its totient is φ = 401896320.

The previous prime is 640523099. The next prime is 640523167. The reversal of 640523127 is 721325046.

It is not a de Polignac number, because 640523127 - 2⁷ = 640522999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 640523094 and 640523103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640523167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368524 + ... + 370257.

Almost surely, 2^640523127 is an apocalyptic number.

640523127 is a deficient number, since it is larger than the sum of its proper divisors (266701169).

640523127 is a wasteful number, since it uses less digits than its factorization.

640523127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738818 (or 738801 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 640523127 is about 25308.5583745894. The cubic root of 640523127 is about 862.0086126834.

The spelling of 640523127 in words is "six hundred forty million, five hundred twenty-three thousand, one hundred twenty-seven".