640209514 has 16 divisors (see below), whose sum is σ = 1098962496. Its totient is φ = 274010400.

The previous prime is 640209487. The next prime is 640209517. The reversal of 640209514 is 415902046.

It is a super-2 number, since 2×640209514² = 819736443632232392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640209517) 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, 19392 + ... + 40699.

It is an arithmetic number, because the mean of its divisors is an integer number (68685156).

Almost surely, 2^640209514 is an apocalyptic number.

640209514 is a deficient number, since it is larger than the sum of its proper divisors (458752982).

640209514 is a wasteful number, since it uses less digits than its factorization.

640209514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60861.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 640209514 is about 25302.3618265173. The cubic root of 640209514 is about 861.8679041342.

The spelling of 640209514 in words is "six hundred forty million, two hundred nine thousand, five hundred fourteen".