640056078 has 24 divisors (see below), whose sum is σ = 1459777800. Its totient is φ = 202122864.

The previous prime is 640056073. The next prime is 640056083. The reversal of 640056078 is 870650046.

It is a happy number.

640056078 is a `hidden beast` number, since 6 + 40 + 0 + 5 + 607 + 8 = 666.

640056078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640056073) and next prime (640056083).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640056073) 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, 935413 + ... + 936096.

It is an arithmetic number, because the mean of its divisors is an integer number (60824075).

Almost surely, 2^640056078 is an apocalyptic number.

640056078 is an abundant number, since it is smaller than the sum of its proper divisors (819721722).

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

640056078 is a wasteful number, since it uses less digits than its factorization.

640056078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871536 (or 1871533 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 640056078 is about 25299.3295958608. The cubic root of 640056078 is about 861.7990453586.

The spelling of 640056078 in words is "six hundred forty million, fifty-six thousand, seventy-eight".