640250530 has 16 divisors (see below), whose sum is σ = 1154015424. Its totient is φ = 255752560.

The previous prime is 640250503. The next prime is 640250531. The reversal of 640250530 is 35052046.

It is a junction number, because it is equal to n+sod(n) for n = 640250495 and 640250504.

It is not an unprimeable number, because it can be changed into a prime (640250531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35656 + ... + 50515.

It is an arithmetic number, because the mean of its divisors is an integer number (72125964).

Almost surely, 2^640250530 is an apocalyptic number.

640250530 is a deficient number, since it is larger than the sum of its proper divisors (513764894).

640250530 is a wasteful number, since it uses less digits than its factorization.

640250530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86921.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 640250530 is about 25303.1723307573. The cubic root of 640250530 is about 861.8863093688.

The spelling of 640250530 in words is "six hundred forty million, two hundred fifty thousand, five hundred thirty".