640841076 has 36 divisors (see below), whose sum is σ = 1622528544. Its totient is φ = 213267600.

The previous prime is 640841057. The next prime is 640841077. The reversal of 640841076 is 670148046.

640841076 is a `hidden beast` number, since 640 + 8 + 4 + 1 + 0 + 7 + 6 = 666.

640841076 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 640841076.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640841077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8611 + ... + 36821.

Almost surely, 2^640841076 is an apocalyptic number.

It is an amenable number.

640841076 is an abundant number, since it is smaller than the sum of its proper divisors (981687468).

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

640841076 is a wasteful number, since it uses less digits than its factorization.

640841076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28852 (or 28847 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 640841076 is about 25314.8390474836. The cubic root of 640841076 is about 862.1512197848.

The spelling of 640841076 in words is "six hundred forty million, eight hundred forty-one thousand, seventy-six".