640527 has 8 divisors (see below), whose sum is σ = 891264. Its totient is φ = 408408.

The previous prime is 640499. The next prime is 640529. The reversal of 640527 is 725046.

It is a happy number.

640527 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 640527 - 2⁶ = 640463 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 640497 and 640506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640529) 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, 4573 + ... + 4710.

It is an arithmetic number, because the mean of its divisors is an integer number (111408).

2⁶⁴⁰⁵²⁷ is an apocalyptic number.

640527 is a deficient number, since it is larger than the sum of its proper divisors (250737).

640527 is a wasteful number, since it uses less digits than its factorization.

640527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 640527 is about 800.3293072230. The cubic root of 640527 is about 86.2010350093.

The spelling of 640527 in words is "six hundred forty thousand, five hundred twenty-seven".