640230755 has 16 divisors (see below), whose sum is σ = 800492544. Its totient is φ = 491017440.

The previous prime is 640230697. The next prime is 640230763. The reversal of 640230755 is 557032046.

It is not a de Polignac number, because 640230755 - 2¹⁴ = 640214371 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2717 + ... + 35886.

It is an arithmetic number, because the mean of its divisors is an integer number (50030784).

Almost surely, 2^640230755 is an apocalyptic number.

640230755 is a deficient number, since it is larger than the sum of its proper divisors (160261789).

640230755 is a wasteful number, since it uses less digits than its factorization.

640230755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38746.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 640230755 is about 25302.7815664602. The cubic root of 640230755 is about 861.8774357710.

The spelling of 640230755 in words is "six hundred forty million, two hundred thirty thousand, seven hundred fifty-five".