640501355 has 16 divisors (see below), whose sum is σ = 863714880. Its totient is φ = 452419968.

The previous prime is 640501319. The next prime is 640501357. The reversal of 640501355 is 553105046.

640501355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640501355 - 2¹⁶ = 640435819 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640501357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212720 + ... + 215709.

It is an arithmetic number, because the mean of its divisors is an integer number (53982180).

Almost surely, 2^640501355 is an apocalyptic number.

640501355 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

640501355 is a deficient number, since it is larger than the sum of its proper divisors (223213525).

640501355 is a wasteful number, since it uses less digits than its factorization.

640501355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428470.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 640501355 is about 25308.1282397573. The cubic root of 640501355 is about 861.9988457375.

The spelling of 640501355 in words is "six hundred forty million, five hundred one thousand, three hundred fifty-five".