640502214 has 32 divisors (see below), whose sum is σ = 1410535296. Its totient is φ = 192275520.

The previous prime is 640502209. The next prime is 640502221. The reversal of 640502214 is 412205046.

It is a super-2 number, since 2×640502214² = 820486172277803592, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38287 + ... + 52410.

It is an arithmetic number, because the mean of its divisors is an integer number (44079228).

Almost surely, 2^640502214 is an apocalyptic number.

640502214 is an abundant number, since it is smaller than the sum of its proper divisors (770033082).

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

640502214 is a wasteful number, since it uses less digits than its factorization.

640502214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90820.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 640502214 is about 25308.1452105839. The cubic root of 640502214 is about 861.9992310902. Note that the first 3 decimals are identical.

The spelling of 640502214 in words is "six hundred forty million, five hundred two thousand, two hundred fourteen".