640081076 has 24 divisors (see below), whose sum is σ = 1237602240. Its totient is φ = 288117632.

The previous prime is 640081073. The next prime is 640081097. The reversal of 640081076 is 670180046.

640081076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640081073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203066 + ... + 206193.

It is an arithmetic number, because the mean of its divisors is an integer number (51566760).

Almost surely, 2^640081076 is an apocalyptic number.

It is an amenable number.

640081076 is a deficient number, since it is larger than the sum of its proper divisors (597521164).

640081076 is a wasteful number, since it uses less digits than its factorization.

640081076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409303 (or 409301 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 640081076 is about 25299.8236357489. The cubic root of 640081076 is about 861.8102646735.

The spelling of 640081076 in words is "six hundred forty million, eighty-one thousand, seventy-six".