640627375 has 8 divisors (see below), whose sum is σ = 799503120. Its totient is φ = 512501800.

The previous prime is 640627333. The next prime is 640627381. The reversal of 640627375 is 573726046.

It is not a de Polignac number, because 640627375 - 2¹⁷ = 640496303 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2562385 + ... + 2562634.

It is an arithmetic number, because the mean of its divisors is an integer number (99937890).

Almost surely, 2^640627375 is an apocalyptic number.

640627375 is a deficient number, since it is larger than the sum of its proper divisors (158875745).

640627375 is an equidigital number, since it uses as much as digits as its factorization.

640627375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5125034 (or 5125024 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 40.

The square root of 640627375 is about 25310.6178312581. The cubic root of 640627375 is about 862.0553753973.

The spelling of 640627375 in words is "six hundred forty million, six hundred twenty-seven thousand, three hundred seventy-five".