640083188 has 12 divisors (see below), whose sum is σ = 1121622852. Its totient is φ = 319619520.

The previous prime is 640083139. The next prime is 640083209. The reversal of 640083188 is 881380046.

640083188 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54346384 + 585736804 = 7372^2 + 24202^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102095 + ... + 108182.

It is an arithmetic number, because the mean of its divisors is an integer number (93468571).

Almost surely, 2^640083188 is an apocalyptic number.

It is an amenable number.

640083188 is a deficient number, since it is larger than the sum of its proper divisors (481539664).

640083188 is a wasteful number, since it uses less digits than its factorization.

640083188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211042 (or 211040 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 640083188 is about 25299.8653751359. The cubic root of 640083188 is about 861.8112125437.

The spelling of 640083188 in words is "six hundred forty million, eighty-three thousand, one hundred eighty-eight".