640178075 has 12 divisors (see below), whose sum is σ = 795452808. Its totient is φ = 511089600.

The previous prime is 640178069. The next prime is 640178081. The reversal of 640178075 is 570871046.

640178075 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 (640178069) and next prime (640178081).

It is not a de Polignac number, because 640178075 - 2¹² = 640173979 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13802 + ... + 38351.

It is an arithmetic number, because the mean of its divisors is an integer number (66287734).

Almost surely, 2^640178075 is an apocalyptic number.

640178075 is a deficient number, since it is larger than the sum of its proper divisors (155274733).

640178075 is a wasteful number, since it uses less digits than its factorization.

640178075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52654 (or 52649 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 640178075 is about 25301.7405527762. The cubic root of 640178075 is about 861.8537958836.

The spelling of 640178075 in words is "six hundred forty million, one hundred seventy-eight thousand, seventy-five".