640229330 has 16 divisors (see below), whose sum is σ = 1241060184. Its totient is φ = 236392320.

The previous prime is 640229297. The next prime is 640229341. The reversal of 640229330 is 33922046.

640229330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 506295001 + 133934329 = 22501^2 + 11573^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 640229293 and 640229302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462291 + ... + 2462550.

Almost surely, 2^640229330 is an apocalyptic number.

640229330 is a deficient number, since it is larger than the sum of its proper divisors (600830854).

640229330 is a wasteful number, since it uses less digits than its factorization.

640229330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924861.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 640229330 is about 25302.7534074851. The cubic root of 640229330 is about 861.8767963264.

The spelling of 640229330 in words is "six hundred forty million, two hundred twenty-nine thousand, three hundred thirty".