640270255 has 8 divisors (see below), whose sum is σ = 768476592. Its totient is φ = 512114688.

The previous prime is 640270231. The next prime is 640270283. The reversal of 640270255 is 552072046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640270255 - 2²¹ = 638173103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25519 + ... + 43951.

It is an arithmetic number, because the mean of its divisors is an integer number (96059574).

Almost surely, 2^640270255 is an apocalyptic number.

640270255 is a deficient number, since it is larger than the sum of its proper divisors (128206337).

640270255 is a wasteful number, since it uses less digits than its factorization.

640270255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25385.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 640270255 is about 25303.5621010165. The cubic root of 640270255 is about 861.8951603483.

The spelling of 640270255 in words is "six hundred forty million, two hundred seventy thousand, two hundred fifty-five".