640054228 has 12 divisors (see below), whose sum is σ = 1221921792. Its totient is φ = 290933720.

The previous prime is 640054223. The next prime is 640054229. The reversal of 640054228 is 822450046.

640054228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 640054228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640054223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7273300 + ... + 7273387.

It is an arithmetic number, because the mean of its divisors is an integer number (101826816).

Almost surely, 2^640054228 is an apocalyptic number.

It is an amenable number.

640054228 is a deficient number, since it is larger than the sum of its proper divisors (581867564).

640054228 is a wasteful number, since it uses less digits than its factorization.

640054228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14546702 (or 14546700 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 640054228 is about 25299.2930336008. The cubic root of 640054228 is about 861.7982150513.

The spelling of 640054228 in words is "six hundred forty million, fifty-four thousand, two hundred twenty-eight".