640587375 has 96 divisors (see below), whose sum is σ = 1269365760. Its totient is φ = 309355200.

The previous prime is 640587373. The next prime is 640587377. The reversal of 640587375 is 573785046.

640587375 is a `hidden beast` number, since 64 + 0 + 587 + 3 + 7 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (640587373) and next prime (640587377).

It is not a de Polignac number, because 640587375 - 2¹ = 640587373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 640587375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640587371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 490974 + ... + 492276.

It is an arithmetic number, because the mean of its divisors is an integer number (13222560).

Almost surely, 2^640587375 is an apocalyptic number.

640587375 is a deficient number, since it is larger than the sum of its proper divisors (628778385).

640587375 is a wasteful number, since it uses less digits than its factorization.

640587375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The square root of 640587375 is about 25309.8276367106. The cubic root of 640587375 is about 862.0374331248.

The spelling of 640587375 in words is "six hundred forty million, five hundred eighty-seven thousand, three hundred seventy-five".