640612355 has 16 divisors (see below), whose sum is σ = 774637344. Its totient is φ = 508569600.

The previous prime is 640612333. The next prime is 640612361. The reversal of 640612355 is 553216046.

It is not a de Polignac number, because 640612355 - 2¹⁰ = 640611331 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 675992 + ... + 676938.

It is an arithmetic number, because the mean of its divisors is an integer number (48414834).

Almost surely, 2^640612355 is an apocalyptic number.

640612355 is a deficient number, since it is larger than the sum of its proper divisors (134024989).

640612355 is a wasteful number, since it uses less digits than its factorization.

640612355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1846.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 640612355 is about 25310.3211160981. The cubic root of 640612355 is about 862.0486381615.

The spelling of 640612355 in words is "six hundred forty million, six hundred twelve thousand, three hundred fifty-five".