640525314 has 32 divisors (see below), whose sum is σ = 1505012544. Its totient is φ = 179167680.

The previous prime is 640525313. The next prime is 640525331. The reversal of 640525314 is 413525046.

It is not an unprimeable number, because it can be changed into a prime (640525313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372409 + ... + 374124.

It is an arithmetic number, because the mean of its divisors is an integer number (47031642).

Almost surely, 2^640525314 is an apocalyptic number.

640525314 is an abundant number, since it is smaller than the sum of its proper divisors (864487230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640525314 is a wasteful number, since it uses less digits than its factorization.

640525314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746562.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 640525314 is about 25308.6015812806. The cubic root of 640525314 is about 862.0095937620.

The spelling of 640525314 in words is "six hundred forty million, five hundred twenty-five thousand, three hundred fourteen".