640123227 has 12 divisors (see below), whose sum is σ = 925046304. Its totient is φ = 426553200.

The previous prime is 640123193. The next prime is 640123259. The reversal of 640123227 is 722321046.

640123227 is a `hidden beast` number, since 6 + 401 + 232 + 27 = 666.

It is not a de Polignac number, because 640123227 - 2¹⁴ = 640106843 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 640123227.

It is not an unprimeable number, because it can be changed into a prime (640127227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6033 + ... + 36285.

It is an arithmetic number, because the mean of its divisors is an integer number (77087192).

Almost surely, 2^640123227 is an apocalyptic number.

640123227 is a deficient number, since it is larger than the sum of its proper divisors (284923077).

640123227 is a wasteful number, since it uses less digits than its factorization.

640123227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32610 (or 32607 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 640123227 is about 25300.6566515575. The cubic root of 640123227 is about 861.8291817391.

The spelling of 640123227 in words is "six hundred forty million, one hundred twenty-three thousand, two hundred twenty-seven".